Features performace sock with integrated heating element you don?t notice heating elements of the latest generation which completely incorporate the toe area optimal moisture transportation ergonomically knitted padding on the exposed parts ring bandages for optimum support on the foot the lithium packs are easy to attach by means of press studs on the legband machine washable at 30 °C Package content 2 lithium pack rcB 1200 (rechargeable) 1 global USB-charger 100–240 VAC 1 USB charging cable with charging indicator 1 pair of Lenz heat socks 4.0