Therm-ic Ultra Warm Comfort S.E.T heated socks are designed for skiers looking for thermal comfort even in extreme conditions. Thanks to the new S.E.T (Smart Elastic Technology), heating is conducted in one discreet seam (warms both under and over the toes). Thanks to this technology, the socks have an elastic fit, offering warmth, comfort and a good fit on the foot. Comes with S-Pack 1200 batteries with up to 8.5 hours of warmth (for socks with S.E.T heating technology). Get the most out of your skiing experience with these technical heated Therm-ic Ultra Warm Comfort S.E.T socks, specially designed for skiers who demand thermal comfort even in extreme conditions. Thanks to our new patented Smart Elastic Technology, these socks fit perfectly on the foot and conform to boots without compromising comfort. The thin S.E.T heating line disperses heat smoothly around the toes without affecting the sock's good fit on the foot. These socks combine thermoregulating knit and merino wool for optimal insulation and breathability. The thermal insulation structure with channels for better moisture wicking and increased breathability support the Smart Elastic Technology heating technology and ensure optimal thermal comfort. Moisture-Vent technology absorbs moisture from the skin in the foot area and transports it out via micro-channels to keep your feet dry. Therm-ic heated socks are ideal for skiers and athletes looking for maximum comfort in extreme conditions. Thanks to their cut, soft warming line (the entire S.E.T heating system is routed in one thin elastic seam) and foot support, they guarantee a pleasant experience not only on the slopes (they can also be used for cross-country skiing, snowshoeing, hiking, hunting, etc.). Thanks to the thermo-regulating knit and efficient moisture wicking, these socks offer optimal insulation and excellent breathability. The socks come with two S-Pack 1200 batteries (3-stage temperature control via a button on the battery) that provide up to 8.5 hours of warmth (for socks with S.E.T heating technology). A USB charging cable is also included. Power supply is not included (the cable can be plugged into a standard USB charger). SET includes: Therm-ic Ultra Warm Comfort Socks S.E.T S-Pack 1200 batteries Size selection - recommendation If you are on the size range, select a smaller sock size. Technical Specifications of S-Pack 1200 Batteries Up to 8.5 hours of warmth (for socks with S.E.T system) USB charging cable included USB mains charger not included (standard mobile phone charger can be used) Compatible with all Therm-ic heated socks Technical features of the socks Medium-weight knit for thermal comfort Patented S.E.T technology - discreet heating system conduction in a single elastic seam Ergonomic fit at foot, ankle and calf Optimum thermal insulation (quality materials including merino wool) Good moisture wicking and breathability Maintenance tips Remove the batteries before washing the socks Turn socks inside out before washing Machine wash the socks at a maximum of 30C with a low spin Do not use bleach Do not use fabric softener Store batteries in a cool place (5 to 20 C) Batteries must be approximately half charged before storage