Therm-ic Boot Heaters

Therm-ic boot-heating systems keep feet warm from inside the boot through full days in the cold — a favorite of skiers who won't compromise on warm toes. This collection brings together the heated insoles, socks, batteries, dryers, and accessories that make up the Therm-ic foot-warming ecosystem, so you can build a complete system or add the piece you're missing.

Therm-ic Boot Heater Buying Guide

How the System Fits Together

Therm-ic foot warmth is built from a few parts: a heated insole or heated sock that carries the elements, a rechargeable battery pack that clips to the boot, and a charger. Getting matching pieces from the same system is what delivers even, reliable heat all day.

Insole or Sock?

Heated insoles work with the boots and socks you already own and are easy to move between pairs. Heated socks build the elements into the sock for a closer, more even feel. Many skiers keep both for different boots and conditions.

Keep It Running and Dry

A boot dryer removes overnight moisture so gear starts warm, and a spare battery keeps you going on the longest days.

Shop related collections: Heated Insoles | Heated Socks | Boot Dryers | All Therm-ic

FAQs

What is a Therm-ic boot heater?

It's heat built into the boot itself rather than worn on your foot. A slim heating element or heated insole sits under your foot inside the ski boot, wired to a rechargeable C-Pack battery that clips onto the boot's power strap or cuff. Skiers and snowboarders favor this design because nothing changes about your sock or boot fit — the hardware disappears into the boot and the batteries ride outside it.

What do I need for a complete boot-heating setup?

Two things: the heat source and the batteries. The heat source is either the Insole Heat kit (element plus trim-to-fit layer, around $43) or the ready-made Heat 3D insoles (around $65). The batteries are a pair of C-Packs. You can buy them together — complete kits run from around $320 up to around $480 with the Bluetooth 1700 batteries — or piece a system together separately. Everything recharges over USB charging cables between ski days.

What's the difference between the C-Pack 1300 and 1700 batteries?

Capacity, mainly — the model number tracks battery size, so the 1700 series runs longer between charges than the 1300 at a given setting. Both come in standard versions, adjusted on the battery itself, and Bluetooth versions you control from a phone app — which matters when the batteries are clipped to ski boots under pants and gaiters. Singles run from around $120 to $200 depending on version; check each product page for that pack's specifics.

Can I replace parts instead of buying a whole new system?

Yes — the system is deliberately modular. Heating elements alone are around $29, replacement boot batteries around $65, single C-Packs are sold in every version, and charging cables are available separately (around $43 to $45). That means a worn element or a lost cable is a small purchase, not a new system. It also means you can upgrade just the batteries — say, to Bluetooth control — while keeping the insoles you've already fitted to your boots.

Should I choose boot heaters or heated socks?

Boot heaters live in one pair of boots and keep your sock drawer normal — best for skiers who want a set-and-forget install in their ski boots. Heated socks travel with you across every pair of footwear you own, which suits people whose cold feet aren't confined to the mountain. Therm-ic makes both, and the battery hardware is the shared foundation either way. If your cold-feet problem is strictly ski days, the in-boot system is the cleaner solution.