If you are a ski or snowboard enthusiast, you know that nothing is more unpleasant than having cold feet during your sessions. In this sense, the Lenz Heat Sock 5.1 Slim Fit socks are your allies for warm and comfortable feet on the slopes. These ski socks are designed to offer you an optimal skiing experience, without being bothered by the cold. Thanks to their integrated heating technology Toe Cap®, the Lenz Heat Sock 5.1 Slim Fit socks ensure absolute comfort, even in freezing temperatures. Their integrated heating technology is powered by a rechargeable lithium battery. The heat can be controlled directly on the lithium block or via the free Lenz heat app on your smartphone. This model is compatible with all types of lithium batteries. Materials: 30% polyester, 25% merino wool, 20% polyamide, 15% polyacrylic, 5% silk, 3% elastane Toe Cap® technology: invisible integrated heating element Better elasticity at the calf Ergonomic fit Slim fit Ring bandage and protections at the toes and heel Lithium battery attachment at the cuff with snap fasteners Compatible with all Lenz lithium batteries. Lenz Heat Sock 5.1 Slim Fit - Ski socks