The Therm-Ic PowerSocks high-performance ski socks are specially designed to keep your feet warm and dry, even on the coldest winter days.Thanks to the Heat Fusion technology, you can say goodbye to cold and numb feet and fully concentrate on your runs down the slopes. With three adjustable heat levels, you can easily regulate the temperature according to your needs and preferences. Additionally, reinforcements on the heels and toes provide the necessary comfort for a long day of skiing. These socks are sold without batteries but are compatible with S-Pack 1400B, S-Pack 1200, S-Pack 700B, and S-Pack 700 batteries from the Therm-ic brand.Give your feet the warmth and comfort they need with the Therm-Ic PowerSocks Heat Fusion socks!Breathable socks with a snug fitEasy and quick battery attachment with snap buttons.Heel and toe reinforcementsHeat Fusion technology: for even heat distribution around the toes.Composition: Acrylic 49%, Polyamide 27%, Merino Wool 10%, Polypropylene 12%, Elastane 2% Therm-Ic PowerSocks Heat Fusion - Ski socks