NIUNIU 1. Battery Operation Enlarge the Heating Elements To give your feet a more balanced warmth, our heated socks feature Enlarge the heating elements of the toes and soles of the feet. keep your feet warm all day when they are fully charged. 2. 3 adjustable temperatures Electric foot warmer with 3-stage temperature, the heating range of the electric socks is between 35 C and 55 C. The red LED corresponds to the high temperature setting, the orange LED corresponds to the medium temperature setting and the green LED corresponds to the low temperature setting. 3. Flame retardant safety cotton The heated warm socks are made of cotton, polyester, spandex. The breathable, quick-drying, specially developed, flame-retardant cotton makes you feel more secure during use. It is more important that the far infrared heating elements of the winter socks can stimulate the blood circulation. They are an ideal gift for people with arthritic feet and cold joints. 4. Washable and an average size The heated sock battery support hand wash and machine wash. Note: Please remember to put the charging cable in the socks first before washing. heated socks unisex with average size. One size that fits everyone, super elastic and stretchy for adults, men and women. 5. Widely Used Best Gift Electric socks are perfect for a variety of indoor or outdoor events such as hunting, hiking, horse riding, fishing, biking, driving, running, camping, skiing, climbing, sleeping, etc. The Ski heated socks could also be an ideal gift for parents, friends, family members and the elderly. Delivery quantity: 1 pair, Colour: Black Kind tips 1. Package content: only the above package content, excluding other products. 2. The size is measured manually, please allow 1-2 cm measurement error. 3. Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.