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The Therm-ic Heat Fusion Uni Socks are unisex heated ski socks that are perfect for anyone looking to stay warm on the mountain. Technical, soft and breathable, they efficiently wick away moisture thanks to their specific micro-channel construction. These heated ski socks also provide maximum comfort in the sensitive areas of the foot, namely the shin, calf and instep. These heated ski socks come with a pair of S-Pack 700 batteries, designed to give you up to 8 hours of warmth during your days in winter sports.