5 Top Foot Warmers to Keep You Warm on the Coldest Days


Foot warmers are the best way to help athletes, sportsmen, skiers, construction workers and anyone wanting to keep their feet warm during outdoor activities. The most popular type of foot warmers don’t need any external energy to activate and are designed to fit inside shoes or boots, so you can wear them at football games, during outdoor winter sports, camping or cold weather hunting. You can also get battery operated foot warmers that are great if you would prefer to have a product that you can reuse for a number of years.

Before you buy

Reusable vs. Disposable– Our top picks include a few reusable and a few disposable foot warmers to choose from.  The better value will depend on how often you are going to be using the foot warmers. If you are only going to be using them infrequently, then you should probably stick with disposable warmers. If you will be using them every day, you should have a look at the Thermacell Heated Insoles. If you will be skiing a lot then you may want to look at the Hotronic Foot Warmer S4 Custom. The Thermacell and the Hotronic warmers are obviously much more expensive up front, but if you are able to get a number of years use out of them they may end up being comparable in price to the disposable warmers.

Uses– Foot warmers can be used for pretty much any outdoor activity you can think of. They work really well for fishing, camping, hiking, skating, skiing, and boarding.

Length of time they stay warm– The amount of heat that you can get from these types of products varies from around 5 hours to a maximum of about 18 hours.

Safety – There are a few safety precautions you need to follow if you are going to be using the air activated foot warmers. You aren’t supposed to apply the warmers directly onto the skin as it could burn the skin. Infants, the elderly and Diabetics should avoid using these types of warmers. For whatever product you buy, read and follow all instructions for use.

Best Foot Warmers 2017

ProductHours of HeatSummaryImage
Hothands Insole Foot Warmer9One of the most popular, inexpensive, one use foot warmers.
Grabber Ultra Thin Foot Warmers5Disposable, air activated foot warmer that comes in small, medium or large.
Heat Factory Foot Warmers6Another excellent budget, air activated, one use foot warmer.
Hotronic FootWarmer S4 Custom18Deluxe foot warmer that is designed for heavy boots with removable liners like ski boots.
ThermaCELL® ProFLEX Heavy Duty Heated InsolesDeluxe battery powered foot warmer that uses Bluetooth technology that lets you control the heat in your boots or shoes.

Top Picks

Hothands Insole Foot Warmers

Hothands make two types of foot warmers (plus toe warmers) Hothands Foot Warmers and Hothands Insole Foot Warmers. Their Foot Warmer style is a rectangular shape that can give up to 6 hours of continuous warmth for the feet (it looks a little bit like their hand warmer and is kind of a unusual design for the foot warmer). Hothands more popular model for the foot is the Insole Foot Warmers. The insole style is a full-length foot warmer that is designed to fit inside shoes or boots. They are single-use, air-activated heat packs that provide up to 9 hours of continuous warmth for the feet. The Insoles are ultra-thin so they will be comfortable and you shouldn’t notice them. The ingredients in the warmer are: iron powder, water, salt, activated charcoal and vermiculite. The ingredients become activated by the air and begin the reaction that produces the heat when they are taken out of the packaging. The only problem with the Hothands warmers is that they are one-size-fits-all, so they aren’t the best if you have very small or very large feet. The size is 9.75 in x 4.5 in. The maximum heat it will get to is 109 F, while the average heat is 99 F.

Hothands.com | Amazon

Grabber Foot Warmers

 

Grabber and Hothands are both subsidiaries of Heatmax, Inc. Not surprisingly the two different brands are pretty similar with how they are made, pricing and packaging. The Hothands brand came out after the Grabber brand and I think they perform a little bit better since they last 9 hours compared to the Grabbers foot warmers that will only give you 5 hours.  The big advantage that the Grabbers foot warmers have over the Hothands is that you have the option to choose a small, medium or large sizing. This is important for those users whose feet are very small or very large. They work well for hunting, fishing, camping and hiking.

Warmers.com | Amazon

Heat Factory Insole Foot Warmer

The other air activated foot warmers that are worth a look are the Heat Factory Foot Warmer.  The ingredients are the same as the Grabber and Hothands warmers (iron powder, charcoal, salt, and vermiculite) with the addition of sawdust. They are a soft, lightweight insole with maybe a bit more thickness than the other two brands.  If left unopened they have a shelf life of approximately three years or more. Once activated, the warmers will provide heat for approximately 8 hours. They are one-size-fits-all and the sizing is 8 x 3 inches.

HeatFactory.com | Amazon

Hotronic FootWarmer S4 Custom


If you are looking specifically for something that would work well with a heavy boot like a ski boot with a removable liner, check out the Hotronic Footwarmer S4 Custom. It is Hotronic’s newest model (it came out in 2016) .This latest model is more powerful and has a longer lasting battery. If you are using it on the lowest setting, you may be able to get up to eighteen hours of heat.

Available here

Thermacell Heated Insoles

Thermacell have three different models of heated insoles to choose from: The Original, The Proflex and the Proflex Heavy Duty.

The Original is the first model that Thermacell put out. It is rechargeable and wireless and has embedded rechargeable lithium ion polymer batteries. There are three adjustable temperature settings (no heat, medium 100 degrees and high 111 degrees) that you can change using a remote control. The Original Thermacell insoles can be recharged up to 500 times with the included charger.  You can trim the sole to get a custom fit. Since the Original is the oldest model with the least amount of features you should be able to get them cheaper than the later models.

 

The ThermaCELL ProFLEX  is the next step up from the Original. It has most of the same features as the Original but the battery isn’t embedded, so you can remove and recharge it. It also has USB charging. You should be able to get around 2,500 hours of use from the ProFlex. The heat settings are the same as the Original: no heat (standby), medium (100°F), and high (111°F).

The newest Thermacell model is the Proflex Heavy Duty. It has most of the same features as the other two models, but now instead of being controlled by a remote control you can use Bluetooth technology from your smartphone to control the heat in your feet. The other big upgrade in this model is that it uses a new quick charging technology so the insoles can be charged in less than two hours. You can learn more about them here.

Therm-ic Sole Perform Heated Insoles

Another option if you are into the battery operated foot warmers are from the Austrian company Thermic. You purchase the sole and the battery pack separately. They have a few different types of soles (Classic, Trimfit, Perform and Kids) and all are one-size-fits-all, except the perform style which has 5 sizes. Once you have chosen your sole, you need to select a battery pack. There are a few different models to choose from, with the main difference being the amount of time the battery lasts and the price. Find more information here.

 

Volt Unisex Indoor Outdoor Heated Slippers

If you just want a product to heat your feet while you are at home, check out the Volt Unisex Indoor/Outdoor Heated Slippers.  They come in 8 different size and 4 different colors. They have a nylon fabric that is insulated with Thinsulate and fleece, as well as a drawstring closure to help keep in the heat. The bottom has a memory foam foot bed with a rubber sole on the outside. They are 6 inches high and 11 inches wide. They come with 4 different heat levels to choose from, with up to 10 hours of heat capacity. They use two rechargeable lithium batteries (that are included) to heat, and they come with a wireless remote that lets you adjust the heat levels. They have pretty mixed reviews, but some people really love them.

Available here.

What to look for

Sizing

Foot warmers often come in a one-size-fits-all option. Some brands to offer different sizes for different sized feet. They are designed specifically for use in winter boots and heavy shoes, so you shouldn’t have much trouble getting a pair that will fit.

Foot Warmers vs Toe Warmers Vs Hand Warmers

To warm your feet, you should look for products that are designed to warm feet. Many people like to use hand warmers on their feet, but it isn’t recommended because hand warmers are made to work in an area that gets more air flow. Foot warmers are made for environments that have a restricted air flow, like a boot. If you just have a problem with your toes getting cold (common problem for cyclists) you should check out Toe Warmers, they will help with cold feet and they are a little bit cheaper than foot warmers.

Are foot warmers safe for children?

Yes, as long as you are supervising the child and they understand that they should tell you if the foot warmer gets too hot. Brands that offer one-size-fits-all will probably be too big for children, because you cannot trim them to be a smaller size.

What is inside an air activated foot warmer?

There are a few different kinds of hand and toe warmers, but the most popular ones contain iron, water, activated carbon, salt, a water reservoir, and vermiculite. When iron is exposed to oxygen, it begins to oxidize and produce heat.

How long do they take to heat up?

As soon as the warmer comes out of the package the oxidation process begins. The heat will gradually start to build up for approximately 20 minutes. You should be able to feel the heat in the warmer after a few minutes of being exposed to the air. Once it is inside the shoe or boot, it will get to a heat between 100 F and 107 F.  You should be a bit careful with foot warmers because they are intended to work in environments that have low oxygen, so if they are let out in the open too long it is possible that they reach temperatures of 165 F, which could be extremely hot if you put that into a boot or a shoe at that temperature. On the other hand, if you are having trouble getting the heat warmer to heat up, you can leave it out in the open to heat it up, once you feel the warmer start to activate you can place it in the boot or the shoe.

Other Safety Precautions

If you are using the air activated heaters, there are a few safety precautions that you should follow:

  • You should follow all directions on the package to avoid serious injuries or burns.
  • Do not apply directly to the skin.
  • Do not use in shoes during vigorous activities such as running
  • Do not use in shoes that have air ventilation holes
  • Never use in oxygen-rich environments
  • For any of the different types of foot warmers you should use extreme caution and/or used under supervision with the elderly, infants, children, people with sensitive skin, and anyone who is unable to feel heat.
  • Consult with your doctor before using a foot warmer if you have diabetes, frostbite, scars, open wounds, or circulatory issues.
  • Remove warmers immediately if they become too hot or feel uncomfortable.
  • Don’t try to open the pouch on the air activated warmers; if they do become open don’t let the ingredients come in contact with your eyes or mouth.
  • Keep all foot warmers out of reach of children and pets.
  • If any of the ingredients of the disposable product are swallowed, call a poison control center immediately.

The Bottom Line

Foot warmers are well worth the investment whether you have to spend hours outside working or you enjoying hunting, skiing, boarding, or hiking in cold weather. You will be surprised at how much these products can improve the experience of a cold weather outdoor activity.