The patented Toe Cap heating element guarantees all-round warmth and heats the toes from above and below. The heat sock 5.0 toe cap slim fit knee socks are ideal for narrow feet and legs. Model Lenz 5.1 Slim Fit is ergonomically knitted for an optimal fit and the ring bandage offers pleasant support on the foot. It is ideal for narrow feet and legs. Shin protectors as well as further reinforcements at toe and heel prevent pressure points. The skin-friendly material mix of merino wool and silk is breathable, fast-drying and comfortable to wear. The lightweight rechargeable lithium pack battery is optional and sits barely noticeable under the special comfort cuff. The heat can be controlled directly on the lithium pack or also via the free Lenz heat app on your smartphone. They are compatible with LENZ lithium pack rcB 1200/1800/2000 batteries. DESCRIPTION improved elasticity in the calf area the Toe Cap heating element encloses the toe area from above and below the integrated, robust and flexible heating element follows all movements ideal for narrow feet and legs ergonomically optimized right/left fit Ring bandage for optimum hold on the foot protectors in the shin, toe and heel area skin-friendly material mix of merino wool and silk washable at 30 degrees in the washing machine lithium pack battery sits under the waistband of the sock compatible with all Lenz lithium packs PACKAGE CONTENTS 1 pair Lenz heat sock 5.1 toe cap SLIM FIT 1 laundry bag no batteries included