The new Therm-ic S.E.T Ultra Warm Performance heated sports socks are designed for experienced skiers who have precisely fitting sports boots and require ski socks that match the weight and cut. They fit optimally on the foot and fit even in tight ski and alpine ski boots, while providing gentle warmth around the toes thanks to the patented S.E.T (Smart Elastic Technology) technology, which hides the heating system in one thin line, in a flat and flexible seam. Thanks to this new technology from the French company Therm-ic, heated sports socks are also available. Thanks to high elasticity, functional and durable polyamide and a significant proportion of merino wool, the new heated socks fit perfectly on the foot, have a thin construction, while maintaining good breathability and thermoregulation capabilities. For all those who want to get the most out of their sports skiing experience, the new Therm-ic Ultra Warm Performance S.E.T technical sports heated socks are designed, which are specially designed for experienced skiers. Their thin construction and new Smart Elastic Technology ensure an optimal fit on the foot, even in tight sports ski boots. The discreet heating line spreads gentle heat around the toes (the heating element is guided in a flat elastic seam around the toes) without restricting the sports cut and high elasticity of the sock. The socks combine thermoregulatory knitting technology of polyamide fibers with merino wool for powerful insulation and breathability. Polyamide fibers provide great durability, support a good cut and fit on the foot thanks to the elastane content. The thermal insulation structures of the knit and the system of breathable channels are strategically placed to work in synergy with the heating technology Smart Elastic Technology. Moisture-Vent technology absorbs moisture from the skin, promotes breathability and keeps the feet dry. These heated socks are also suitable for alpine ski boots. On the way up you will appreciate their good contact with the foot and breathability, on the way down you can turn on the heating and significantly improve the thermal comfort in the alpine ski boot. To sum up, the Ultra Warm Performance S.E.T heated socks have an optimal sports cut and provide both performance and thermal comfort for experienced skiers. They have a thin and soft S.E.T warm line and thermo-regulating knitting technology to keep your feet warm and dry even in extreme conditions. Thanks to their thin construction and optimal cut, these socks will allow you to get the most out of your sports activities. The socks are sold without batteries. Find all compatible batteries by clicking here. Three heat levels are available, to adapt the heat to your needs. We recommend choosing the more capacious S-Pack 1200 or S-Pack 1400B batteries for socks with S.E.T technology. Size selection - recommendation If you are on the border of sizes, choose a smaller sock size, especially if you have a narrower foot. Technical features of heated socks Slim construction and optimal sports cut Patented S.E.T technology - discreet heating system in one flat seam Ergonomic fit in the foot, ankle and calf area Optimal thermal insulation (quality materials including merino wool) heating Good moisture wicking and breathability Maintenance tips Remove batteries before washing socks Turn socks inside out before washing Machine wash socks at a maximum of 30 with a low spin cycle. Do not use bleach Do not use fabric softener Package includes: 1 pair of Therm-ic heated socks Batteries not included