Product Material: cotton + carbon fibre Size: (flexible sole length, 20cm; sock length, 23cm; sock opening, 9cm Cotton + carbon fibre Size: (flexible) sole length, 20cm; sock length: 23cm; sock opening: 9cm Voltage: 3.7V Capacity: 04500 mAh Temperature control: 3 levels of adjustable temperature. Low end, 35 degrees C; Mid end, 45 degrees C; High end, 55 degrees C: Grey, black Quantity. 1 pair Package contents: 1 pair of 100% heated socks (band and charger) 1. Manipulation and amplification element To give your feet a more balanced warmth, our heated socks have amplified heating elements in the toes and soles. When fully charged, they will keep your feet warm all day. PS: The display of the adapter will light up red during charging and green when fully charged. 2. 3 temperature adjustable heated socks, the heated socks have a heating range between 35°C and 55°C. The red LED corresponds to the high temperature setting, the orange LED to the medium temperature setting and the green LED to the low temperature setting. 3. Flame-retardant safety cotton The heated thermal socks are made of cotton, polyester and spandex. Breathable, quick-drying and specially developed with flame retardant cotton to make you feel safe during use. Note: Please remember to unplug the charging cable before washing. Heated socks can also be an ideal gift for parents, friends, family and the elderly.