Never freeze again with patented Toe Cap technology. The flat, sewn-in heating element is not bulky and provides all-round warmth for the toes - for up to 14 hours. The fit in the calf area is ideal thanks to the increased elasticity. The socks are thus also perfectly suitable for stronger calves and thanks to the comfort cuff nothing slips. The knee-high heat sock 5.1 toe cap has an integrated shin protector and protectors in the toe and heel area. Thanks to the ring bandage, the socks do not slip on the foot. The sophisticated material mix of merino wool, silk and functional fibers dries quickly and efficiently wicks away moisture. The rechargeable lithium pack can be attached to the sock cuff with snaps. The heat socks are compatible with all lithium packs of the Lenz Body Heat System. The temperature can be conveniently controlled on your smartphone with the free Lenz heat app or directly on the lithium pack. Features: Improved elasticity in the calf area Toe Cap technology - all-round warmth for the toes The flat, sewn-in heating element is not bulky Anatomically knitted for optimal fit Ring bandage guarantees stabilisation in the ankle and forefoot area Integrated protectors on shin, toe and heel as well as ring bandage Material mix of merino wool, functional fibres and silk Machine washable at 30 degrees The lithium pack can be attached via press studs on the sock cuff Suitable for all Lenz lithium packs Material: 30% polyester 25% wool (merino) 20% polyamide 15% polyacrylic 5% silk 5% spandex Package Contents: 1 pair Lenz heat sock 5.1 toe cap 1 laundry bag