Hotronic Custom S4 Heating Elements Foot Warmer Kit

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Keep feet happy and toasty with the Custom S4 Footwarmer kit from Hotronic, designed to charge and spread warmth through compatible insoles for long-lasting comfort in freezing weather.

  • Features

    • Designed for use with Hotronic Heat Ready Insoles (sold separately) or on custom insoles, orthotics, or insoles of your choice, creating custom-warmed footbeds
    • Installs in all types of footwear, and transfers easily from one pair of footwear to another
    • S4 comes with all you need to customize your ski, snowboard or hiking boots using insoles of your choice
    • Kit includes 2 battery packs with heat regulators, 1 recharger with American and European adapters, 2 heating elements and 1 pair of Cambrelle covers and strips
    • Features 4 temperature / durations settings, including a timed setting for an extra blast of heat
    • Setting level 1 heats from 84° to 98° F (29° to 37° C) for 16.5 - 21 hrs.
    • Level 2 heats from 107° to 121° F (42° to 49° C) for 7.5 - 10 hrs.
    • Level 3 heats from 122° to 138° F (50° to 59° C) for 5 to 7.5 hrs.
    • Level 4: 158° to 173° F (70° to 78° C) for 2.5 to 4.5 hrs.
    • Level 4, which can be used in 3-min. intervals or continously, is meant for a burst of heat; CAUTION: Using longer may result in burns
    • Battery pack LEDs indicate whether power is on or off and selected heating level; lights blink when heating level 4 is selected to run continuously
    • High-capacity, rechargeable batteries are designed for cold-temperature operation; battery packs attach outside for easy operation
    • Batteries maintain up to 55% of a full charge and 95% of the initial capacity after 4 years of non-use


    View all Hotronic Hand and Foot Warmers
  • Technical Specs

    Best Use



    Downhill Skiing




    15.5 x 9.25 x 2 in inches


    2 lbs. 0.8 oz.

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    14 reviews with an average rating of 3.3 out of 5 stars

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