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Hotronic FootWarmer S4 Custom

4.5 4.5 out of 5 stars 314 ratings
Currently unavailable.
We don't know when or if this item will be back in stock.
Brand Hotronic
Color Black
Included Components Battery
Reusability Rechargeable

About this item

  • The new S series batteries offer more than ever before, including enhanced reliability, longevity, and performance
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Product Description

Hotronic S4 Custom Foot Warmer Red

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Hotronic FootWarmer S4 Custom

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Customer reviews

4.5 out of 5 stars
4.5 out of 5
314 global ratings

Customers say

Customers like the quality, warmth and comfort of the appendage warmer. For example, they mention it works fantastic, keeps their feet warm enough and that they don't really feel the heat. That said, opinions are mixed on ease of installation, battery life, and value.

AI-generated from the text of customer reviews

88 customers mention66 positive22 negative

Customers like the quality of the appendage warmer. They say it works fantastic, and can attest to its performance. Some say the installation was simple, and the product works flawlessly all winter. Some customers also say it's a technical piece of equipment, and a life saver for those who get cold easily.

"...They worked like a charm. Warm feet all day (even when temperatures went to -23 °C)...." Read more

"Used 6 times in ski boots this winter. This is a technical piece of equipment. I have poor circulation, my toes get cold and these heater work ...." Read more

"I have been using these for 3 ski seasons now. These are amazing - a life saver for me. My feet get cold very easily...." Read more

"...At lunchtime on the third day, everything looked great when I reached down to turn the heat up in preparation for doing some deep powder runs...." Read more

81 customers mention72 positive9 negative

Customers like the warmth of the appendage warmer. They say it keeps their feet warm enough to ski, and they don't really feel the heat. They also say it's designed to keep their feet above freezing so their blood won't leave. Customers also mention that it has 4 heat settings and they only need level 1 so far.

"...This is the best heating system, no fuss, just bend over and adjust setting for heat setting, no taking on/off ski boot to adjust. 5 star." Read more

"...These are amazing - a life saver for me. My feet get cold very easily. I honestly might not be able to ski for long on many days without these...." Read more

"...Set on 50% power, she is warm in the coldest of conditions and the battery pack lasts at least 10 hours..." Read more

"...They have 4 heat settings and I have only needed level 1 so far. So glad I spent the money and have these a try, worth every penny...." Read more

14 customers mention12 positive2 negative

Customers like the comfort of the foot warmer. They mention that it feels great, and is able to stay comfortable in single digits. Some say that the comfort is worth the money.

"...What a game changer!!! On the lowest setting, your feet are comfortable all day...." Read more

"...You don't really feel the heat. Your feet just feel normal, but definitely not cold...." Read more

"...I usually set them on 'level 2' and my feet are kept very comfortable and I have not fully depleted the charge on the batteries, even during these..." Read more

"...And now that she has the foot warmer she can ski comfortably. Great product. I highly recommend it" Read more

7 customers mention7 positive0 negative

Customers find the appendage warmer versatile. They say it's great for skiing when the temperature dips below -30C. Customers also say it extends their skiing time and makes for a better day of skiing.

"...are staying warm in 5 degree temperature skiing and I can ski longer and with more comfort." Read more

"...They last a full day skiing, and keep my raynauds from acting up...." Read more

"...She is cold no matter what, but these let her ski ALL DAY LONG...." Read more

"...It still an OK product as it does extend my skiing time." Read more

54 customers mention36 positive18 negative

Customers are mixed about the ease of installation. Some mention it's easy to install and intuitive to use, while others say it'll be a little tricky to install. The instructions are hard to understand and the setup is pretty elaborate.

"...This is the best heating system, no fuss, just bend over and adjust setting for heat setting, no taking on/off ski boot to adjust. 5 star." Read more

"...liner - but just following the video available online and they installed perfectly. Did not affect my fit at all...." Read more

"...slowly to make sure I was doing it right and still it was difficult every step of the way...." Read more

"These work very well at keeping your feet warm and were not terribly difficult to install...." Read more

33 customers mention20 positive13 negative

Customers have mixed opinions about the battery life of the appendage warmer. Some mention that the batteries last a long time, while others say that they're bulky and prone to disconnection.

"...between 15 and 28 degrees out,I used mostly on level 2 and lasted all day 6+ hours...." Read more

"...the end of the third day as I was taking off that same boot...the battery was GONE and so was the bracket!!..." Read more

"...These have been reliable over the last 3 years. I had no issues installing them myself...." Read more

"They work very well and last a long time. Follow the directions on installing them to the letter...." Read more

30 customers mention19 positive11 negative

Customers are mixed about the value of the appendage warmer. Some mention it's worth the price, a great investment, and worth the money and time to install. Others say it'd be a waste of money for skiing.

"...So glad I spent the money and have these a try, worth every penny...." Read more

"...The system may seem expensive.... but.... how much have you spent on a single lift tkt!!?? For a single day!!??..." Read more

"Love my warmers!If you work outside its worth the investment...." Read more

"...and dicing and taping your insoles and liners, but it is so well worth the effort...." Read more

4 customers mention0 positive4 negative

Customers are dissatisfied with the wires on the appendage warmer. They mention that the wire is exposed, it's broken, and the plug is defectively designed.

"...The simple fact is that the plug is defectively designed...." Read more

"...The wiring going into the boot is exposed and the wires are broken. Not too happy about this, Guess we'll see if the warranty is any good." Read more

"this product worked ok... The wiring on this product sucks.... Used my pair 6 full days with brackets that were recommended and the wire housing..." Read more

"These will malfunction due to the awful power cable used...." Read more

Frozen feet no more - pricey but warm feet all day
5 Stars
Frozen feet no more - pricey but warm feet all day
These footwarmers were gamechangers for me. I've been skiing for some 30 years and never had cold feet.Then, two years ago I had to leave my boots on those "airblowing & warming poles" they install in ski chalets (at least in the Alps). Unfortunately, one night these didn't work; leaving my boots cold, and more problematic: still wet from the day before. While skiing in freezing temperatures (in my quite hard and not 'cushioned' boots) I literally froze my feet. They were white and numb. In the months following, I slowly regained feeling in my toes, but it took more than a year to have a normal feeling again. What stayed: I get cold feet very quickly now, where I never had cold feet before. At night when working on my desk, when walking in cold temperatures, ...Last year I took some of those chemical packets that you can put in your gloves for some hours of warmth and put them under my toes. They helped some, but were very uncomfortable. So this year I invested in the Hotronic S4 custom and installed them in my boots. I dried/warmed my boots during the night (with blowers I carry with me). Before skiing, I put them on "3" for 15 minutes, then reduced to "2" and went skiing. They worked like a charm. Warm feet all day (even when temperatures went to -23 °C). I do not feel them in my boots (installed them myself) and I click the batteries on the backside of my boots. Hardly ever put them on "3". (guess the trick is to start with warm feet and keep them that way).Only downpoint: I would look for a more secure attaching mechanism next time. I'm lucky my ski pants have those elastic band to keep snow out, as I found the battery twice in there. They had loosend from my boot (lifts, jumps, ...) but were caught there. Maybe one of their clips, or some duct tape would do the trick.I bought extra soles (without the batteries, as I'll reuse the ones I have) to use in my shoes/slippers/...
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Top reviews from the United States

Jeroen Thibaut
5.0 out of 5 stars Frozen feet no more - pricey but warm feet all day
Reviewed in the United States on January 11, 2018
Verified Purchase
These footwarmers were gamechangers for me. I've been skiing for some 30 years and never had cold feet.Then, two years ago I had to leave my boots on those "airblowing & warming poles" they install in ski chalets (at least in the Alps). Unfortunately, one night these didn't work; leaving my boots cold, and more problematic: still wet from the day before. While skiing in freezing temperatures (in my quite hard and not 'cushioned' boots) I literally froze my feet. They were white and numb. In the months following, I slowly regained feeling in my toes, but it took more than a year to have a normal feeling again. What stayed: I get cold feet very quickly now, where I never had cold feet before. At night when working on my desk, when walking in cold temperatures, ...

Last year I took some of those chemical packets that you can put in your gloves for some hours of warmth and put them under my toes. They helped some, but were very uncomfortable. So this year I invested in the Hotronic S4 custom and installed them in my boots. I dried/warmed my boots during the night (with blowers I carry with me). Before skiing, I put them on "3" for 15 minutes, then reduced to "2" and went skiing. They worked like a charm. Warm feet all day (even when temperatures went to -23 °C). I do not feel them in my boots (installed them myself) and I click the batteries on the backside of my boots. Hardly ever put them on "3". (guess the trick is to start with warm feet and keep them that way).
Only downpoint: I would look for a more secure attaching mechanism next time. I'm lucky my ski pants have those elastic band to keep snow out, as I found the battery twice in there. They had loosend from my boot (lifts, jumps, ...) but were caught there. Maybe one of their clips, or some duct tape would do the trick.
I bought extra soles (without the batteries, as I'll reuse the ones I have) to use in my shoes/slippers/...
Customer image
Jeroen Thibaut
5.0 out of 5 stars Frozen feet no more - pricey but warm feet all day
Reviewed in the United States on January 11, 2018
These footwarmers were gamechangers for me. I've been skiing for some 30 years and never had cold feet.Then, two years ago I had to leave my boots on those "airblowing & warming poles" they install in ski chalets (at least in the Alps). Unfortunately, one night these didn't work; leaving my boots cold, and more problematic: still wet from the day before. While skiing in freezing temperatures (in my quite hard and not 'cushioned' boots) I literally froze my feet. They were white and numb. In the months following, I slowly regained feeling in my toes, but it took more than a year to have a normal feeling again. What stayed: I get cold feet very quickly now, where I never had cold feet before. At night when working on my desk, when walking in cold temperatures, ...

Last year I took some of those chemical packets that you can put in your gloves for some hours of warmth and put them under my toes. They helped some, but were very uncomfortable. So this year I invested in the Hotronic S4 custom and installed them in my boots. I dried/warmed my boots during the night (with blowers I carry with me). Before skiing, I put them on "3" for 15 minutes, then reduced to "2" and went skiing. They worked like a charm. Warm feet all day (even when temperatures went to -23 °C). I do not feel them in my boots (installed them myself) and I click the batteries on the backside of my boots. Hardly ever put them on "3". (guess the trick is to start with warm feet and keep them that way).
Only downpoint: I would look for a more secure attaching mechanism next time. I'm lucky my ski pants have those elastic band to keep snow out, as I found the battery twice in there. They had loosend from my boot (lifts, jumps, ...) but were caught there. Maybe one of their clips, or some duct tape would do the trick.
I bought extra soles (without the batteries, as I'll reuse the ones I have) to use in my shoes/slippers/...
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37 people found this helpful
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Megan Pitsch
5.0 out of 5 stars watch utube viedo to install yourself.
Reviewed in the United States on June 2, 2019
Verified Purchase
Used 6 times in ski boots this winter. This is a technical piece of equipment. I have poor circulation, my toes get cold and these heater work . It was between 15 and 28 degrees out,I used mostly on level 2 and lasted all day 6+ hours. I did need level 3 sometimes in Morning when its coldest out, just recharge and good to go the next day. The recharger has indicator lights to tell you when they are fully charged. I did not have to leave charging over night, it takes 3-4 hours to recharge. I pre heated boots by turning on15 minutes b-4 putting boots on. don't forget to recharge in off season when not in use. The only issue I had was I did hit the battery/ which I was located on back top of ski boot while getting on the chair lift. They have a strong wire clip on battier to hold battery in place. This is the best heating system, no fuss, just bend over and adjust setting for heat setting, no taking on/off ski boot to adjust. 5 star.
3 people found this helpful
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Chuckster Runner
5.0 out of 5 stars Excellent - Saved my cold feet !
Reviewed in the United States on February 7, 2019
Verified Purchase
I have been using these for 3 ski seasons now. These are amazing - a life saver for me. My feet get cold very easily. I honestly might not be able to ski for long on many days without these. I can now go from open to close (I set to 2 of 4 lights) and don't need to take a break except on the very coldest of days. These have been reliable over the last 3 years. I had no issues installing them myself. It took a little while - I wanted to make sure I did not adversely affect my boot liner - but just following the video available online and they installed perfectly. Did not affect my fit at all. I recommend you go for the S4 - I dont know how long the battery on the S3 would last.
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C. Taber
4.0 out of 5 stars Great at keeping feet warm - needs more secure mounting option to avoid costly battery replacement!
Reviewed in the United States on February 4, 2016
Verified Purchase
These work very well at keeping your feet warm and were not terribly difficult to install. I installed them in about an hour into my custom Surefoot foot beds. My ski boots are Lange RX 130s and the stock liners had a space at the back of the heel for threading the cable out and up along the spine of the boot to the top. I found a helpful 10 minute long installation video on YouTube and followed those instructions without too much trouble. I took my time because I didn't want to have any "oops" moments wielding a razor blade around my expensive foot beds...

As an FYI (not a complaint), these batteries are quite large - about the size and weight of a pack of playing cards each. My brother has Sidas boot warmers which, while about twice as expensive as these, use lithium ion batteries rather than the 4 cell NiMH batteries in these, so his are about 1/2 the size and weight of mine. Just make sure that you account for that if the legs/gators of your ski pants are at all narrow.

My only complaint about this product has more to do with the available options for mounting on my ski boots. I chose the "Hotronic Slide Strap Brackets" see:  Hotronic Slide Strap Bracket  which looked to be well-designed, had decent reviews, and were also easy to install. I also chose an off-center, outside/rear mounting position so that I could minimize the chance of dislodging the battery during a chairlift loading/unload. In addition, I was very conscious of letting my feet slide slightly forward when I sat down on and stood up from the lift.

After the first day, everything was fine. After the second day, I noticed that one of the brackets had worked its way a little bit loose, so I tightened everything up and everything looked fine. At lunchtime on the third day, everything looked great when I reached down to turn the heat up in preparation for doing some deep powder runs. At the end of the third day as I was taking off that same boot...the battery was GONE and so was the bracket!!

I retraced my steps back to the base area, went back the next morning to the lifts where I had been riding in the afternoon, to the ski valet, to the lost-and-found...all with no luck. My only other idea of where it could have come off is that it might have worked its way loose on the landing to one or more jumps while I was skiing through a terrain park near the end of the day, and then fallen out of the gator of my pant leg as I was finishing my run down the hill. Regardless of how it happened, that's a $70 bummer of a way to end an otherwise great ski weekend.
One person found this helpful
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Doug
5.0 out of 5 stars NSP, National Ski Patroller. I've used these for years and on my 3rd set
Reviewed in the United States on August 25, 2023
Verified Purchase
They work very well and last a long time. Follow the directions on installing them to the letter. Complaints of the heating elements going out are usually due to improper installation of the heating elements (which you can replace for about $20). And like anything they will wear out. I usually get 6 to 8 years out of a set and they are used multiple times per week. Also follow the battery care instructions.
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Top reviews from other countries

John
4.0 out of 5 stars Works well, expensive
Reviewed in Canada on February 8, 2019
Verified Purchase
I use for skiing. Used so far three times at -20C. I have an acquaintance who has had them 5 years and is happy with performance. Downsides non potability and very expensive.
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