Features: 1. These electric socks are made of superior pure cotton material, which is comfortable, soft, breathable, and elastic. 2. With upgraded heating elements, the winter heating socks are heating uniform, and have temperature stability, which will let your feet no longer be cold and stiff in the cold winter. 3. Designed with 3 levels of temperature which can be adjusted according to your preference. 4. Easy to wash with water. 5. Perfect for camping, skiing, and even wearing at home. Specification: Size: about 22*28*10cm/8.66*11.02*3.93 inches Material: pure cotton Weight: about 175g/pair Packing List: Heated thermal socks*2