Therm-ic Heated Socks, Insoles & Boot Heaters

Explore boot heaters, heated socks, gloves, vests, insoles, batteries and boot dryers.

Therm-ic Buying Guide

Reviewed by The Warming Store gear team · Updated July 2026

Therm-ic focuses on the extremities — the places that go numb first — and has long been associated with heating systems for ski boots. Heated socks, heated insoles, boot-heating kits, and heated gloves and mittens make up the range, with a strong following among skiers and anyone whose feet or hands give out before the rest of them does. Most of the line runs on rechargeable C-Pack and S-Pack batteries adjusted through the Therm-ic Heat Control app.

Heated Socks: Sets vs. Socks-Only

Therm-ic heated socks use patented Heat Fusion knitting that spreads warmth around the whole foot rather than at a single point. They sell two ways: complete PowerSock sets that include the matching S-Pack battery, or socks-only versions for riders who already own the batteries. Socks-only pairs start from around $95; buy the set first, then add socks-only spares later. Grab compatible S-Pack and C-Pack batteries if you're topping up an existing kit.

Insoles and Boot-Heating Kits

Therm-ic heated insoles slide into your existing boots and heat from underneath. The Insole Heat elements and heat-ready insoles start from around $43 as components, while complete C-Pack heat kits — element, insole and battery together — run from around $320. Insoles are the go-to for skiers whose boots are already dialed in and can't spare room for a thicker sock.

Socks or Insoles for Tight Boots

The choice comes down to fit. If your feet are cold all over, socks wrap the whole foot and are the simplest upgrade. If your boots are snug and only your toes freeze, insoles add warmth without the extra bulk that can crowd toes and restrict circulation — which is what makes feet colder in the first place. When a boot is truly tight, insoles almost always win.

Heated Gloves and Mittens

When hands are the weak link, Therm-ic heated gloves and mittens — including the Ultra Heat Boost line and lobster-style power gloves — bring the same rechargeable, app-controlled warmth to your fingers, starting from around $320. Mittens keep fingers together for the most warmth; gloves trade a little heat for dexterity.

Batteries, Chargers and Dryers

Therm-ic's power range is deep: C-Pack 1300 and 1700 packs for insoles, S-Pack and PowerSock batteries for socks, plus chargers, extension cords and a universal power bank, many with Bluetooth so you can trim heat from your phone. Spare batteries and chargers start from around $65. A boot dryer from around $65 keeps your boots dry between days — warmer feet start with dry boots.

Who Therm-ic Is For

Therm-ic's roots are on the mountain, and skiers and snowboarders remain its core, but the socks, insoles and gloves work just as well for winter runners, hikers, hunters and anyone standing on cold ground for hours. The app-controlled batteries let you dial heat up on the lift and down on the bootpack, so a single charge stretches across a full day out.

FAQs

What does Therm-ic specialize in?

Feet, mainly. Therm-ic is built around heated socks, heated insoles and boot heating systems, with heated gloves alongside them. It's a narrower focus than the head-to-toe heated apparel brands, and the reason people seek them out is that cold feet in ski boots is a specific, stubborn problem that general heated clothing doesn't solve.

Should I choose Therm-ic heated socks or heated insoles?

It depends on your boots. Heated socks wrap the whole foot, so warmth surrounds your toes — the better answer if your entire foot gets cold and your boots have room to spare. Heated insoles go inside the boots you already own and heat from beneath, which makes them the right choice for ski boots or work boots where a thicker sock would ruin a precise fit.

Will heated insoles fit my ski boots?

Usually, but fit is the whole question and it's worth resolving before you buy rather than after. Ski boots are deliberately tight, and anything that crowds your toes restricts circulation — which makes your feet colder, not warmer. Insoles are typically designed to replace the factory insole rather than sit on top of it, which is exactly why they work where a thick sock doesn't.

Are Therm-ic batteries specific to Therm-ic products?

Generally yes. Batteries, chargers and connectors differ between heated brands and rarely cross over. If you're building a heated foot setup, staying inside one system means one charger and packs that work across the products you own.