Features:Three heating modesThere are three heating modes for you to chooser freely, including 40 Celsius(for daily life), 50 Celsius(for working) and 60 Celsius(for outdoor), sufficing your different using needs.Durable modal materialMade of high quality modal material, wear resistant and durable, not easy to get deformed or pilling, owning long using life span. Good breathable ability brings you comfortable using experience.High elasticity and waterproof resistanceWith two times higher elasticity then the normal fabric, the sock can cover you foot and ankle carefully, waterproof and washable, available to be used for many times. Good elastic design makes it universal for different sizes of foot.Big battery capacityAdopting 5v 2200mah big capacity power banks, the socks can support for long time working time, no need for recharging frequently.Double layersSpecification:Type: heating sockQuantity: 1 setMaterial: modal+ cashmere + plastic + electric componentColor: black / gray /MulticolorHeating modes: three modesBattery capacity: 2200mahVoltage: 5vOperating hours:High temperature-4hLow temperature-8hMid-range-6hPackage:2* heating sock2* power bank1* cable