The Powersocks Heat Fusion Uni ND are unisex heated ski socks. 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 1400 batteries, designed to give you up to 16 hours of warmth during your days in winter sports. These batteries are equipped with Bluetooth technology, so you can control the heating of your socks from your smartphone. Sidas Fusion Uni S-1400B Heated Socks | X-Large | Christy Sports