Heated Socks Our rechargeable heated socks are equipped with two 5000mAh lithium polymer batteries, which can provide you with 6-12 hours of warmth. 360-degree even heating allows you to do everything in comfort. Soft, comfortable, and durable heated socks are made of safe materials. Thanks to the specially designed breathable, quick-drying flame-retardant cotton, you'll feel safer during use. What's more, the infrared heating element of heated socks stimulates blood circulation. 3 types of adjustable temperature heating socks have 3 temperature adjustment functions, including high temperature (149F, 5-6 hours), medium temperature (131F, 7-8 hours) and low temperature (113F, 10-12 hours). You can adjust the amount of heat you need based on hot or cold conditions. Conveniently designed sock comes with two batteries. To improve comfort, we designed the battery to be curved and lighter. Compared to other battery types on the market (cylindrical), our battery feels smaller and can be worn with boots. One Size Fits All Our heated socks are stretchy and unisex, making them suitable for most people. A great winter gift for yourself, family and friends. Machine washable, please put the heated socks in the included laundry bag before washing to avoid tearing of the charging cord.