Men's Rechargeable Heated Socks in Cotton Made from 100% cotton, these socks are absorbent, breathable, washable and quick drying. Super comfortable, thick and durable. Fast heating These battery heated socks are made from a composite fibre heating material with a built-in heating element that covers the entire forefoot, stimulating blood circulation and keeping you warm all day long. You can feel the temperature in less than 30 seconds. Keeps your feet warm and healthy in winter. Rechargeable and 3 adjustable heat levels The heated socks are powered by a pair of 3.7V rechargeable lithium batteries (not included) and the product has a heat capacity of 35-55. In addition, the heated socks are designed with 3 heat settings. 3 levels of heat control are set to allow you to adjust your preferred temperature to suit different temperature needs.