Free Shipping on Orders Over $49 | 1/2 Price on 2 Day Air | Easy Returns   

Expert Advice Hotline 888-754-2368,  Weekdays 11-6,  Sat. 10-5, Sun 12-5, eastern time

SkiCenter.com Accepts Amazon Payments

Amazon Payments lets you pay easily and securely on our site with the information in your Amazon account. When you're ready to buy, simply click the Checkout with Amazon button on our shopping cart page, enter your e-mail address and password, and select from the shipping and payment information stored in your Amazon account.

  • Checkout is quick and easy. You don't have to re-enter credit card numbers or addresses.
  • Shop confidently knowing that your payment information is protected.
  • All your purchases are protected by the A-to-z Guarantee, the same buyer protection plan available at Amazon.com. The condition of the item you buy and its timely delivery are guaranteed

Amazon, Amazon Payments and the Amazon Payments logo are trademarks of Amazon.com, Inc. or its affiliates.

Hotronic E4 Custom Footwarmers

This product is currently unavailable for purchase.

Usually Ships within 1 Business Day
Bookmark and Share
E4 Custom Footwarmers are sold out, we will be shipping next years model, the S4 for the same price!

The Hotronic Footwarmer Power Plus S4 is one of the best heated insoles for ski boots.  With four batteries in each Battery Pack, the Footwarmer Power Plus S4 is Hotronic's longest lasting, most powerful FootWarmer.  The S4 is compatible with custom insoles or orthotics, or insoles of your choice.  If your feet get cold easily while skiing, the Hotronic Footwarmer Power Plus S4 is for you.  It also makes a great gift. To install the Hotronic Footwarmer Power Plus S4, take them to a trusted bootfitter near you. If you plan on installing them on your own please read the installation instructions provided below.

Installation Guide

Contents Include:
  • 2 S4 Battery Packs with integrated heat regulator
  • 2 Heating Elements
  • 1 pair of self-adhesive Cambrelle fabric covers and strips
  • 1 Recharger with American & European Plug Adapters
Tech Specs:
  • NiMH cells
  • 4 temperature settings
  • Easy to use controls
  • Easy to read LED indicator lights 
  • Battery Packs easily attach
  • 4 cells for long battery life
  • No memory effect, can recharge without fully draining the battery
product reviews post a review


"Very happy with Hotronics, plus free shipping"
12/22/2011 9:05 AM Mike
Was a little skeptical at first, but these are the best boot warmers on the market. Takes a bit of time to get them installed properly, but it's time and $ well spent. My girlfriend always complained of cold feet and had to make frequent stops in the lodge to thaw out her toes. This past week we skied two days and her feet were comfortable the whole time. These don't get hot or make your feet sweat, just keep them warm the entire day. For $10 you can get better clips to secure the "white" battery pack to the boot strap. Good luck trying to find them in the snow if crash hard enough and they fall off. Overall I'm very happy with this purchase. Great investment for me as my girlfriend won't complain about frozen toes ever again and I get to spend more time on the slopes.

"Very happy with Hotronics, plus free shipping"
12/22/2011 9:05 AM Mike
Was a little skeptical at first, but these are the best boot warmers on the market. Takes a bit of time to get them installed properly, but it's time and $ well spent. My girlfriend always complained of cold feet and had to make frequent stops in the lodge to thaw out her toes. This past week we skied two days and her feet were comfortable the whole time. These don't get hot or make your feet sweat, just keep them warm the entire day. For $10 you can get better clips to secure the "white" battery pack to the boot strap. Good luck trying to find them in the snow if crash hard enough and they fall off. Overall I'm very happy with this purchase. Great investment for me as my girlfriend won't complain about frozen toes ever again and I get to spend more time on the slopes.