[Electric heated socks - feet are no longer cold] The heated socks are made of breathable, quick-drying and specially developed flame retardant cotton, which gives you greater peace of mind during use. More importantly, the far infrared heating element of the winter socks can stimulate blood circulation.[Washable-Unisex] The heated socks battery supports hand wash and machine wash. Note: Remember to put the charging cable in the socks before washing. One size fits everyone, super stretchy and stretchy, suitable for adults, men and women.[Rechargeable heated socks] The heated socks are equipped with 2 pairs of 3.7V rechargeable lithium-ion batteries / 4000 mAh. Compared with other rechargeable heated socks, they are more compact and ergonomic. Men's thermal socks can be heated for about 4-8 hours per charge.[3 adjustable temperatures] Karcore electric foot warmer, 3 temperatures, electric socks heating range between 38C and 65C, temperature high 65C (H bright), medium temperature 45C (M bright)), low temperature Set to 38C (L light is on). You can choose the temperature you want according to your preference.[Widely used and the best gift] Karcore electric socks are very suitable for various indoor or outdoor activities, such as hunting, hiking, riding, fishing , cycling, driving, running, camping, skiing, mountaineering, sleeping, etc.