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Best Hand Warmers

last updated May 14, 2019

Cold days in the outdoors can not only be uncomfortable but also dangerous, especially for your small extremities like fingers and toes. These parts of the body are especially susceptible to frostbite. A high-quality hand warmer will work wonders for keeping you toasty and safe while you engage in any number of outdoor activities. Finding the right hand warmer is more complicated than you might think. They come in a variety of styles that are each best suited for different activities. Some are also reusable, while others only last for one use. This article is here to help you choose the hand warmer that will work the best for whatever your needs are, and features a variety of styles that represent the very best of what is available.

In a Hurry? The test winner after 8 hrs of research

icon
HOTHANDS
97.3/100 our score
Ease of Use
100
Effectiveness
96
Size
96
HOTHANDS
Why is it better?

Small enough to fit in gloves, hat, or boots

Lasts all day

Easy air activation

Stays very hot

Come in multiple styles

In a Hurry? Editors choice:
HOTHANDS
Test Winner: HOTHANDS
Researched Sources
14
Researched Sources
Reviews Considered
1,098
Reviews Considered
Hours Researching
8
Hours Researching
Products Evaluated
10
Products Evaluated
Last Updated:
By Sami Kritz:

❄ Bite frost back with one of these top-rated hand warmers! We have updated each product review to make them easier to read, added an FAQ and an expert tip. With our new interactive format, you can vote on which criterion is most important to you and then re-order the list accordingly! ❄

Sorting Options
Ease of Use Effectiveness Size By Default
Rank
PictureProduct
Name
Rating
Shops
#1
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
97.3
Ease of Use
100%
Effectiveness
96%
Size
96%
Price Comparison Last Updated (22.05.19)
$25.93
#2
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
96
Ease of Use
100%
Effectiveness
95%
Size
93%
Price Comparison Last Updated (22.05.19)
$26.05
#3
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
95.3
Ease of Use
100%
Effectiveness
91%
Size
95%
Price Comparison Last Updated (22.05.19)
$29.99
#4
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
95
Ease of Use
98%
Effectiveness
87%
Size
100%
Price Comparison Last Updated (22.05.19)
#5
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
94.7
Ease of Use
99%
Effectiveness
90%
Size
95%
Price Comparison Last Updated (22.05.19)
$34.99
#6
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
93.3
Ease of Use
90%
Effectiveness
96%
Size
94%
Price Comparison Last Updated (22.05.19)
$8.00
#7
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92
Ease of Use
97%
Effectiveness
95%
Size
84%
Price Comparison Last Updated (22.05.19)
$35.95
#8
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.3
Ease of Use
98%
Effectiveness
86%
Size
90%
Price Comparison Last Updated (22.05.19)
$42.61
#9
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90.7
Ease of Use
98%
Effectiveness
93%
Size
81%
Price Comparison Last Updated (22.05.19)
$39.99
#10
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.7
Ease of Use
84%
Effectiveness
89%
Size
90%
Price Comparison Last Updated (22.05.19)
In Depth Review Top 10
  • HOTHANDS
  • HEAT FACTORY PREMIUM
  • LITTLE HOTTIES
  • GRABBER OUTDOORS
  • HOTSNAPZ
  • CELSIUS LONG LASTING WARMTH
  • OUTDOORS WAY ELECTRIC
  • CELESTRON FIRECEL PLUS
  • ENERGYFLUX ENDURO
  • ZIPPO
Table of contents
  • Criteria Used for Evaluation
  • Other Factors to Consider
  • Frequently Asked Questions
  • Sources

Top 10 Picks

1. HOTHANDS

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
97.3
HOTHANDS
Ease of Use
100
Effectiveness
96
Size
96
best offer for today
$25.93
Pros:

Small enough to fit in gloves, hat, or boots

Lasts all day

Easy air activation

Stays very hot

Come in multiple styles

Cons:

Take some time to warm up

Single use

HotHands Hand Warmers are unquestionably the highest quality choice for single use hand warmers. Offering long lasting heat, these will easily fit in your gloves, boots, or hat, and are a great choice for anyone who recreates or works outside during the winter.

Read more

Ease of Use
These hand warmers are air activated. Simply tear the outer packaging and they will begin to heat up. They do take some time to get warm though, so opening them a half hour before you actually want to use them is recommended. Once hot though, they maintain a temperature of above 100°F for many hours.

Each of these hand warmers can only be used once, however, each should last for many hours meaning you will not have to replace them throughout the day. The airtight packaging that these come in also ensures that you don’t have to worry about them going bad, although there is an expiration date.

Effectiveness
These hand warmers reach an external temperature of about 110 degrees Fahrenheit. Users recommend kneading the packets to speed up the heating process. Hothands is a trusted brand name and produces very effective products.

Size
These hand warmers are small and flexible, so they are perfect for putting inside your gloves. They also come in a style specifically designed to go inside your boot.

2. HEAT FACTORY PREMIUM

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
96
HEAT FACTORY PREMIUM
Ease of Use
100
Effectiveness
95
Size
93
best offer for today
$26.05
Pros:

Small enough to fit in gloves, hat, or boots

Easy air activation

Lasts all day

Cons:

Single use

Heat Factory Premium Hand Warmers are a small, pliable option that works best for use on the go. Able to fit in your gloves, hat, or other small compartments, this hand warmer is well suited for activities like skiing, hiking, and biking.

Read more

Ease of Use
This hand warmer is air activated and begins to heat when its packaging is torn. The material inside is made of iron powder, charcoal, salt, and vermiculite, and is completely non-toxic and biodegradable.

These hand warmers can only be used once. For this reason, they are typically sold in large quantities. Despite being single-use, only expect to need one per day, as these hand warmers last for many hours. However, they do not seem to actually last for the 10 hours advertised.

Effectiveness
These have been referred to as a "must have" by reviewers. The temperature is not listed but it is said they these hand warmers become very hot.

Size
Small enough to fit in the palm of your hand, these hand warmers are compact and easy to store.

3. LITTLE HOTTIES

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
95.3
LITTLE HOTTIES
Ease of Use
100
Effectiveness
91
Size
95
best offer for today
$29.99
Pros:

Come in packs of two

Last all day

Easy air activation

Small enough to fit in gloves, hat, or boots

Cons:

Single use

Little Hotties Hand Warmers are air-activated hand warmers that come in packs of two, making it easy to remember a hand warmer for each hand. They are also small enough to fit inside gloves, making them an excellent choice for skiing as well as any other wintertime aerobic activity.

Read more

Ease of Use
These hand warmers are air activated. They come in sealed bags and begin to heat up when the bag is ripped. They do have expiration dates, which can affect the warmth. These hand warmers should remain hot for 5-6 hours.

These are single-use hand warmers. Once they have been used once they must be thrown away.

Effectiveness
The activated temperature of these hand warmers is about 135 degrees Fahrenheit. Most reviewers love these hand warmers while others complain that the batch they received are slow to heat or not hot enough.

Size
The small size of these hand warmers makes them perfect for putting in your gloves, boots, or hat while you exercise in the winter. Activities that these hand warmers are well suited for include skiing, snowboarding, hiking, climbing, and biking.

4. GRABBER OUTDOORS

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
95
GRABBER OUTDOORS
Ease of Use
98
Effectiveness
87
Size
100
best offer for today
more shops
Pros:

Small enough to fit in gloves, hat, or boots

Come in several styles

Easy air activation

Cons:

Takes some time to warm up

Single use

Grabber Outdoors Hand Warmers are designed to offer convenience and versatility on the go. Small and malleable, they easily fit inside your clothing so that keeping your hands and toes warm as you ski, hike, run, or bike becomes easy.

Read more

Ease of Use
These are air activated hand warmers that start warming as soon as you open the packaging. They do take 10 to 20 minutes to heat up, so make sure to activate them with a little extra time to spare.

These are single-use hand warmers that last anywhere from 6 to over 10 hours depending on the conditions and how old the hand warmer is. This means that although you can only use each of these once, you won’t have to replace your hand warmers throughout the day.

Effectiveness
While the temperature is not listed by the manufacturer, a home experiment proved that the external temperature of the warmers reaches about 135 degrees Fahrenheit. Reviewers are impressed with the hand warmers but some claim that they don't last quite as long in windy conditions.

Size
These small hand warmers come in several different styles designed to accommodate your hands, feet, or body. Each style is tailored to fit easily in the appropriate clothes so that it can keep you warm and you’ll barely notice that they are there.

5. HOTSNAPZ

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
94.7
HOTSNAPZ
Ease of Use
99
Effectiveness
90
Size
95
best offer for today
$34.99
Pros:

Heat up very quickly

Reusable

Cons:

Heat only lasts for a half hour to an hour

The HotSnapZ Hand Warmers are the only option on this list that is both malleable and reusable. However, they are too large to fit in your gloves, boots, or hat, and are therefore best suited for activities such as light hiking or watching outdoor events in the cold. How quickly they warm up also makes these hand warmers an excellent choice for staying warm on the morning commute.

Read more

Ease of Use
These hand warmers are activated by clicking the internal button that can be found in each. Gently massaging the hand warmer also helps to stimulate the chemical reaction that produces the heat. Once activated, these hand warmers will last for about a half hour to an hour.

Once these hand warmers have been used, the non-toxic filling transforms from a liquid form to a solid one. To reuse a hand warmer, place it in boiling water until the filling becomes liquid again. Make sure that the hand warmer does not touch the side of the pot, as this can burn it and cause it to break.

Effectiveness
The external temperature of these hand warmers is about 115-120 degrees Fahrenheit when activated. Reviewers claim that they heat up in about 1-2 minutes and recommend kneading the packet to speed up the process.

Size
These hand warmers fit well inside a pocket. Due to this and the short amount of time that they stay hot, they are best suited for activities that don’t require all-day warmth.

6. CELSIUS LONG LASTING WARMTH

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
93.3
CELSIUS LONG LASTING WARMTH
Ease of Use
90
Effectiveness
96
Size
94
best offer for today
$8.00
Pros:

Reusable

Old-school style

Lasts all day

Cons:

Can be difficult to light

Gets almost too hot – handle with care

The Celsius Long Lasting Warmth is an old-school style hand warmer made with a simple charcoal stick placed in a box. This hand warmer gets extremely hot and is best for use in frigid temperatures you find while doing things like winter camping or ice fishing.

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Ease of Use
This hand warmer uses a live charcoal stick to produce heat. Light the stick carefully and make sure it doesn’t touch anything. To be sure that the charcoal stick is fully lit, lightly blow on it. You want there to be at least a centimeter of red-hot coals to ensure that it won’t go out once placed in its box. Each use lasts for 6 to 8 hours.

This hand warmer is reusable. The charcoal sticks do eventually burn out completely, but it is possible to buy replacements once this happens.

Effectiveness
The exact temperature isn't listed but some reviewers have noted that sometimes the stick becomes too hot and some recommend putting it in a sock to avoid burning your skin. While the fuel included works well, some reviewers claim it smells bad and have bought different fuel.

Size
This hand warmer is too large and stiff to fit inside a glove. It is best placed in a pocket, sleeping bag, or simply carried around.

7. OUTDOORS WAY ELECTRIC

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92
OUTDOORS WAY ELECTRIC
Ease of Use
97
Effectiveness
95
Size
84
best offer for today
$35.95
Pros:

Reusable

Doubles as flashlight and charger

Has two heat settings

Lasts all day

Cons:

Takes a long time to charge

Bulky

The Outdoors Way Electric Hand Warmer is a multipurpose tool that includes a flashlight and a charger as well as providing heat at two different temperatures. The low heat setting gets up to 105°F while putting this charger on high heat will bring the temperature up to 115°F.

Read more

Ease of Use
This hand warmer is button activated. Once it is producing heat, both sides become warm and it can stay warm for 5 to 7 hours depending on if you have it on the high or low heat.

This hand warmer comes with a USB cable that allows it to be recharged after every use. It does take some time to charge fully, so plan accordingly.

Effectiveness
This hand warmer has two different heat settings, 105 or 115 degrees Fahrenheit. Users are impressed by its functionality and only wish it were a different shape. This is a great device to keep your hands warm, your phone charged, and can even be used as a flashlight.

Size
Able to fit in the palm of your hand or your pocket, this hand warmer I a great choice for staying warm during outdoor events and while boating or going on mellow hikes. It will not fit in a glove, and can even be a bit bulky in a pocket though.

8. CELESTRON FIRECEL PLUS

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.3
CELESTRON FIRECEL PLUS
Ease of Use
98
Effectiveness
86
Size
90
best offer for today
more shops
$42.61
Pros:

Charges quickly

Reusable

Doubles as flashlight and charger

Adaptable heat settings

Cons:

Only lasts for two hours

The Celestron FireCel Plus is an extremely versatile hand warmer that also works as a charger and a flashlight. The flashlight has a red light and a white light setting. The heat itself is adaptable on this product, offering you the choices of low or high heat and heating one side or both sides of the hand warmer. This is by far the most adaptable product on this list.

Read more

Ease of Use
This hand warmer is activated using buttons found on the device. Overall it is simple to use. Once activated, the heat warmer can easily be turned off. In total, it can only provide about two hours of consistent heat.

This hand warmer is reusable and is reactivated by charging. It charges very quickly, only taking about three hours to go from being fully dead to completely charged.

Effectiveness
The temperature of this device is not listed but reviewers seem to be very pleased with the product. It is great for day trips but many people seem to be enamored with the other perks of the warmer, including the flashlight and charging capabilities.

Size
This hand warmer easily fits in the palm of a hand, making it small enough to go in pockets, but too large to fit in smaller items of clothing. This makes it a good choice for activities where pockets are easily accessible such as hiking, camping, fishing, or hunting.

9. ENERGYFLUX ENDURO

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90.7
ENERGYFLUX ENDURO
Ease of Use
98
Effectiveness
93
Size
81
best offer for today
$39.99
Pros:

Reusable

Doubles as flashlight and charger

Lasts all day

Adaptable heat settings

Cons:

Bulky

Heavy

The EnergyFlux Enduro is a rechargeable hand warmer that also comes with a flashlight and charging capabilities. It works really well, heating quickly and maintaining its temperature for a long period of time. It is somewhat bulky though and is, therefore, best suited for more sedentary activities such as fishing, camping, or outdoor events.

Read more

Ease of Use
All the different features on this hand warmer are activated by pressing the same button. Included in the settings is the ability to choose high or low heat. The low heat will use the charge on the hand warmer less quickly, but whichever you choose, expect it to last at least 5 hours.

This is a reusable hand warmer that runs off a battery and can be recharged when that battery runs out.

Effectiveness
Featuring two heat settings, you can choose a temperature of 109 or 115 degrees Fahrenheit. Users are very pleased with the product and heat output. The battery life has been known to not live up to the manufacturer's 7-hour claim.

Size
This hand warmer is bulky, and although it will fit in your pocket, it will take up all the space there. They are also heavy, and best suited for activities where you will not be moving very much.

10. ZIPPO

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.7
ZIPPO
Ease of Use
84
Effectiveness
89
Size
90
best offer for today
more shops
Pros:

Lasts for 12 hours

Reusable

Comes with a small pouch

Cons:

Difficult to turn off

Smells like lighter fluid

Bulky

The Zippo Hand Warmer runs off Zippo lighter fluid and provides all-day warmth. It works best for activities that last all day, such as working in cold weather, hunting, fishing, or hiking.

Read more

Ease of Use
This hand warmer requires a lighter to be activated. Take off the top compartment to easily light the hand warmer. It will continue burning until it runs out of fuel. If lit when full this hand warmer should run for about 12 hours. It can also be turned off by cutting off the oxygen it receives, which can be done by wrapping it in a cloth or placing it in a plastic bag.

This reusable hand warmer that gets its energy from the lighter fluid. To refill, simply remove the top of the hand warmer and pour lighter fluid down the hole.

Effectiveness
While the exact temperature isn't listed, reviewers are pleased with the heat output of this hand warmer and guess that the temperature is around 120 degrees Fahrenheit. This hand warmer works well and should be used with caution. A few users have reported that the device can be hot to touch.

Size
This small hand warmer can easily fit in your pocket. It also comes with a small pouch that can be tied on a string and worn around your neck without being noticeable. It is too large and bulky to be worn inside other types of clothing.

Criteria Used for Evaluation

Ease of Use

How easily a hand warmer can be activated is important if you will be using it far from civilization. For example, although rechargeable warmers may be the most convenient in the city, if it runs out of juice in the backcountry it suddenly becomes dead weight. Air activated warmers are the simplest to get started, and although they become trash after one use, their light weight means that they are easy to pack out of any wildness adventure. Within the reusable hand warmer market, fuel powered warmers are the easiest and most lightweight option for activation in the backcountry. Ones that utilize liquid fuel do require you to bring more lighter fluid if you want to be able to continue using it once it has run dry.

In this section, we also noted if the hand warmer is re-usable or not. Usually, you can tell by looking at them, but with some of the more innovative products on our list, such as the charcoal sticks, it's not always clear. The primary reason to use a single-use hand warmer is that these products tend to be lighter, malleable, and very small. This makes them easy to fit into small areas in your clothing such as the inside of gloves and boots. This is ideal for aerobic activities like skiing or running. There are downsides to this style of hand warmer though. They are very wasteful, and although the individual warmers often only cost a dollar or two, they become expensive when used in bulk.

While buying a reusable hand warmer will be more expensive up front, if you purchase a quality product it will last you for years to come. This means saving money over the long haul. Reusable warmers do tend to be larger and bulkier than the single-use variety, but this can be nice if you are using it for a more sedentary activity. Whichever type of hand warmer you choose is more a matter of preference than superiority.

Effectiveness

How Long the Heat Lasts
Possibly the most important factor to consider when buying a hand warmer is how long the heat will last. On average, most warmers will stay warm for 5-7 hours. Some last much longer than that, while others may only last for an hour or two. Hand warmers that use fuel tend to stay warm for the longest periods of time. For the rest of the styles, how long you can expect a hand warmer to stay warm varies from product to product. Think about how many hours you will need to be using your hand warmer for and do your research carefully before purchasing a product.

How Hot It Gets
Hand warmers heat up to varying degrees. The lowest temperature that a hand warmer should be able to maintain to produce the desired warming effects is 100°F, however many get much hotter than this, reaching temperatures of 115°F to 120°F. Fuel powered warmers tend to be the hottest, while rechargeable warmers often come with multiple settings so you can be specific about how much heat is released. The heat output of other types of warmers depends on the specific product that you purchase.

Size

Another thing to consider before purchasing a hand warmer is where you will keep it. If you plan to keep it in a bag or large coat pocket, the size and weight of the hand warmer are not very important. However, if you would like to put it in small areas such as the inside of your gloves, boots, or a tight pocket, then you want to make sure you buy one that will be compact and barely noticeable.

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Not just for your hands

The uses of hand warmers are quite extensive! Use your hand warmers to warm up a drink, dry wet shoes, and socks, or on aching muscles when you're camping!

Put on a pause on the heat

If you open up a 10-hour use hand warmer and only use it for a couple of hours, you can still save the rest of the heat for another time. This is achievable by cutting off the air source that activates the packet. Put the warmer in a Ziploc and squeeze out all of the air. This, in a way, "pauses" the heating of the packet.

Batteries and Electronics

Have you ever been in such cold weather that your electronics stop working? Whether it's a phone, camera, or another battery-operated device, they just don't seem to function well in cold temperatures. Another great use for hand warmers is to add one to your purse or bag where you keep your electronics. You wouldn't want to miss a great shot of Chicago's "Bean" covered in snow, would you?

Other Factors to Consider

Style

There are many different styles of warmers available for purchase. Each style fulfills different needs. In this section, each type of hand warmer will be discussed, with particular attention given to how each works and the type of activities it is best suited for.

The only viable single use warmers on the market are air activated warmers. These products are filled with a non-toxic mixture of iron, cellulose, carbon, salt, and vermiculite. That produces heat when exposed to the air. Since this reaction can only take place once, these warmers are rendered useless after they have been used. Still, air activated warmers remain wildly popular because they are very small and malleable, meaning they can be placed in small spaces like your gloves or shoes without being obtrusive or uncomfortable. This small size coupled with the fact that these warmers keep for a very long period of time makes them perfect for activities like skiing and snowboarding, biking, climbing, and hiking.

Safety Hazards

While most hand warmers aren't necessarily a "safety hazard" it is advised to always use them cautiously. For obvious reasons, you want to avoid eye contact and keep them out of reach of children and animals.

The most "unsafe" hand warmers would be those that are ignited by lighter fluid, such as the Zippo hand warmer. As long as these are used correctly, they are totally safe. It is important to thoroughly read the instructions and refill the warmer correctly and with the appropriate fluid.

Frequently Asked Questions

q: Are there any dangers associated with using hand warmers?

a:

Some warmers become very hot and can burn you when handled exposed skin. Be careful when touching warmers. If it seems like there is a danger that it will burn you, use a cloth to grab it.

People with sensitive skin sometimes react to the chemicals found in air activated and reusable liquid to solid warmers. If you know that you are susceptible to these types of reactions try to avoid using these products. If that is not possible, avoid making direct contact between your skin and the warmers.

Finally, if you chose to use a fuel-powered hand warmer, be extra careful. This style of hand warmer does not use an open flame but does utilize flammable gas and live coals. If you open the products while they are burning, do so carefully and in a controlled setting.

q: Which activities use warmers the most?

a:

Hand warmers are used to stay warm while doing a wide variety of activities. One of the most common places to see warmers are ski slopes. Skiers and snowboarders will place small, air activated warmers in their gloves and boots on frigid days. This little extra bit of heat can make the difference between a comfortable and miserable day on the slopes.

Hunting and fishing are other activities where warmers can be very useful. These pastimes require one to stay still for long periods of time. On frigid days, even with the proper layers, being still for hours can become incredibly cold. Keeping a hand warmer tucked in your pocket can work to greatly improve the experience. Do keep in mind that if you are fishing, warmers that will continue to work when we are probably a good idea.

Finally, warmers can also greatly improve the experience of less adventurous activities like watching an outdoor concert or ballgame and commuting to work in the winter. These examples are just a few of the activities that warmers are compatible with. Really, due to the many different styles that they come in, they can be used while doing almost anything. Just think about what your specific needs are and make sure that the hand warmer you pick has features that accommodate these necessities.

q: What are some unconventional ways to use warmers?

a:

Most of the time warmers are placed in your pockets, gloves, or boots, however, these are not the only ways that they can be used. Place one at the bottom of your sleeping bag to keep your toes warm while you sleep, or in your chalk bag as you climb on a chilly day. There are endless ways that warmers can be used, you just have to be creative.

q: How can one troubleshoot a hand warmer if it isn’t working?

a:

There are a number of reasons why a hand warmer may not be working. Air activated warmers have expiration dates, so if that is the style you are using make sure that it hasn’t gone bad. With all reusable warmers, make sure that it has battery or fuel before deciding that the product is broken.

A common reason that it might seem like your hand warmer is broken is using it in an unconfined space. Hand warmers are designed to keep small spaces of your person warm. Their heat output is high enough to warm a pocket or glove, but won’t be very effective if you are trying to use it in the open air. If this is how you’re using your hand warmer and it doesn’t seem to be working, place it in a pocket before giving up.

If your hand warmer does break, reach out to the company you makes it and see if they have any advice or are willing to help you get a new product. Most of the time they will want to ensure that you have a quality customer experience.

q: How much should one pay for warmers?

a:

The most expensive warmers on the marker will cost you around $50. In general, though, you should expect to pay between $20 and $30 for a quality reusable hand warmer. Air activated warmers are much cheaper, with a price point of around one or two dollars per product. However, keep in mind that they can only be used once and therefore cost more over time. If you expect to use hand warmers on a daily basis it is much more economical to pay a little more up front and invest in a reusable hand warmer.

q: Can I use hand warmers underwater?

a:

Above land isn't the only place that gets cold! The underwater temperature while scuba diving can be about 40-degrees Fahrenheit. Besides the old trick of peeing in your wetsuit, what else can you do? The good news here is that some reusable hand warmers, such as Hot Snapz, can be used underwater! These make a great addition to a scuba diving or snorkeling trip.

Sources