Therm-ic

French Alps thermal comfort brand | Born commercially in 1998 from ski boot heating development and now part of Sidas Group | Known for: heated ski socks, heated insoles, C-Pack and S-Pack batteries, heated gloves, boot dryers, Heat Control app and Freeride World Tour gloves | Focus: keeping feet and hands warm so skiers can stay comfortable, precise and focused in cold conditions

Cold feet, ski boots and the 1998 Therm-ic breakthrough

Therm-ic is not a ski manufacturer, boot brand or film crew. It belongs to a quieter but essential part of the ski ecosystem: thermal comfort. The brand’s story began with the problem every winter athlete understands immediately. A perfect ski day can be ruined by cold feet or frozen hands, no matter how good the skis, boots or outerwear are. Therm-ic’s early roots go back to heating experiments for ski boots in the 1970s, but the brand took its recognizable commercial shape in 1998, when a heated insole system made the concept practical for ski boots and everyday winter footwear.

That origin gives Therm-ic a very specific identity. It was built around one problem before becoming a broader outdoor brand: how to keep extremities warm in harsh conditions. For skiers, this is not luxury. Cold toes affect balance, concentration, confidence and how long someone can stay outside. A skier with numb feet may lose feel inside the boot, adjust stance poorly, stop skiing early or become distracted at exactly the wrong moment. Therm-ic’s purpose is simple but important: preserve warmth without destroying fit, mobility or the feeling of the boot.

Socks, insoles, gloves and dryers across the warmth system

Therm-ic’s modern product range is built around heated socks, heated insoles, heated gloves, warm gloves, dryers, batteries, chargers, warmers, neckwear, baselayers and outdoor accessories. In ski shops and bootfitting environments, the two most important categories are heated socks and heated insoles. Heated socks use integrated heating lines around the toes and forefoot, powered by S-Pack batteries attached near the cuff. Heated insoles use heating elements and C-Pack batteries, turning a normal insole or bootbed into an active heat source.

The product range also extends to hands. Heated ski gloves include models such as Ultra Heat Boost, Freeride Ultra Heat, Lobster 3 plus 1, Powergloves and thin heated liners. For skiers who do not need active heat, the warm glove and mitten lines still target insulation, waterproofing and winter durability. Dryers are another important part of the system. A boot dryer or glove dryer is less glamorous than a heated sock, but dry liners, dry gloves and dry boots make the next ski day warmer before it even begins.

Toe warmth without ruining boot feel

Therm-ic performance is best understood inside the boot. Ski boots are tight by design. A sloppy fit reduces control, but a fit that is too tight can reduce circulation and make feet colder. That tension is exactly where heated products become useful. A good heated sock needs to add warmth without adding bulky seams, wrinkles or pressure points. A good heated insole needs to work with the boot’s fit rather than lifting the foot into the shell or creating an uncomfortable ridge under the toes.

The Ultra Warm Performance S.E.T heated sock shows the brand’s current direction. Therm-ic describes it as a thin technical sock for expert skiers, with a discreet heating line, Smart Elastic technology, moisture management, merino wool, polyamide support and S-Pack 1400B batteries offering up to 9 hours of heat with Bluetooth compatibility. That matters because expert skiers often ski in close-fitting boots. A bulky heating solution can solve warmth but ruin precision. Therm-ic’s strongest products try to balance both: warmth for comfort, thinness for fit and moisture management for long days.

Max Hitzig, Marcus Goguen and the Freeride World Tour glove test

Therm-ic’s snow sports credibility increased with its Freeride World Tour partnership. The brand became official glove supplier to the FWT for a three year period, supporting elite athletes as well as the teams working behind the scenes at each event. That is a serious environment for thermal gear. Freeride competitions involve exposed faces, long waits, high wind, changing snow, safety crews, camera teams and athletes who need dexterity before dropping into consequential terrain.

The partnership also connects Therm-ic to freeriders such as Max Hitzig, Marcus Goguen, Léo Slemett, Aymar Navarro, Juliette Willmann and Manon Loschi. For the brand, this is more than a logo placement. Freeride gloves must keep hands warm while still allowing pole grip, binding checks, zipper use, radio handling, boot adjustments and safety movements. If a glove is warm but clumsy, it fails. If it is dexterous but cold, it also fails. Therm-ic’s freeride direction sits exactly between those two needs.

Voiron, Sidas Group and one foot still in the snow

Therm-ic is now located in Voiron, in the French Alps, and is part of Sidas Group. That connection is important because Sidas is deeply linked to foot comfort, insoles, bootfitting and sports orthopedics. Therm-ic adds heat and thermoregulation to that ecosystem. Together, the logic is clear: fit, support and warmth are connected. A skier does not experience them as separate categories inside a boot.

The brand’s international presence also matters. Therm-ic’s official story says the company grew into roughly 30 countries and formed partnerships with ski, snowboard and work footwear players, including Rossignol, Tecnica, K2 and Sievi. That kind of reach makes Therm-ic more than a small accessory label. It is an ingredient and specialist brand that lives inside boot rooms, ski shops, rental conversations, instructor gear bags and cold climate work environments. Its geography is French today, but its original problem is universal anywhere skiing happens in low temperatures.

C-Pack batteries, S-Pack batteries and Heat Control by phone

Therm-ic’s construction story is centered on batteries, heating lines and control. Heated socks use S-Pack batteries. Heated insoles use C-Pack batteries. Some battery versions include Bluetooth control, allowing users to adjust heat remotely through the Therm-ic Heat Control app. That is useful because skiers rarely need maximum heat all day. Starting too high can drain batteries quickly or make feet sweat. Starting lower and adjusting during the day can extend runtime and keep warmth more stable.

The details matter. Therm-ic’s heated insole kit with C-Pack 1700B batteries is listed with up to 17 hours of heat and Bluetooth control. Its S.E.T Ultra Warm Performance sock bundle with S-Pack 1400B batteries is listed with up to 9 hours of heat. Heated freeride gloves use multiple heat levels and, depending on model, combine active warmth with waterproof membranes, leather construction, reinforcement and abrasion resistance. The best Therm-ic setup is not only about choosing the highest battery number. It is about matching power, boot fit, sock thickness, moisture management and the length of the ski day.

Second Life batteries and the maintenance side of heated gear

Therm-ic’s sustainability angle is practical rather than decorative. The brand offers a Second Life range with reconditioned technical products, including batteries for heated insoles, batteries for heated socks, boot dryers and other accessories. For an electronics-based warmth brand, this matters. Batteries are often the first part of a heated system to age, fail or become outdated. Giving those products a reconditioned channel can extend use and reduce waste while giving customers a less expensive way to complete a kit.

Maintenance is also part of the product reality. Heated socks must be washed carefully, batteries removed, dried flat and recharged periodically. Boot dryers and glove dryers help prevent moisture buildup, odor and cold starts the next morning. Battery care is not optional if the skier wants reliable performance. Therm-ic products reward people who treat them like technical equipment, not disposable gadgets.

Choosing Therm-ic by feet, hands and how cold you run

The easiest way to choose Therm-ic is to start with the body part that ruins your day first. If toes get cold but boot fit is already precise, heated socks may be the cleanest solution. Skiers in tight performance boots should choose thinner models and avoid anything that creates folds or pressure. If the skier already uses custom footbeds or needs heat across multiple footwear setups, a heated insole kit may be more flexible. C-Pack batteries are useful for longer days, especially when Bluetooth control helps manage output.

For hands, the choice is between warm gloves, heated gloves, mittens and liners. Riders with very cold fingers may prefer heated mittens or lobster-style options because shared finger warmth helps. Freeriders and ski tourers may prefer gloves with better dexterity, especially if they handle skins, radios, zippers, buckles or avalanche gear. For families, instructors and skiers who ride many days per season, dryers may be the smartest first purchase. Dry boots and gloves make every other warmth product work better.

Why Therm-ic matters to skiers even without making skis

Therm-ic matters because cold is one of skiing’s most ordinary and most underestimated performance limits. A skier can have excellent skis, tuned edges, premium boots and a strong jacket, but cold feet or hands can still end the day. Warmth changes how long someone can train, how calmly they wait in a lift line, how well they feel their boots and how focused they remain in exposed terrain. Therm-ic’s value is not in changing the shape of a turn. It is in helping the skier stay present long enough to keep making turns.

For skipowd.tv, Therm-ic belongs in the sponsor ecosystem because it solves a problem that connects every level of skiing: beginners, instructors, racers, freeriders, park crews, camera operators, FWT staff and cold handed parents all understand it. The brand’s importance comes from its specialist focus, Sidas Group backing, bootfitting relevance, heated socks, heated insoles, heated gloves, dryers, Heat Control app and freeride partnerships. It is not the most visible brand in a ski edit, but when the temperature drops, it can become the difference between one run and a full day outside.