The temperature rises quickly, and only 5V Bank power is needed, and you can carry a portable traveling light with you. It is the first choice for warmth.Heated boots and warm socks, brushed feet are soft, comfortable and elastic.Electric socks are made of absorbent, breathable, quick-drying, elastic and thick material.Use thin and soft water as the electrical module, which can be washed with water.The perfect indoor warm foot cover, suitable for cold weather. Also very suitable for outdoor sports activities-outdoor.Voltage: 5 voltsPower supply: mobile power or USB chargerFabric: Cotton, SpandexHeating area: soleSize: Socks are free size, very suitable for men and womeninclude:1 x pair of socks, 1 x AC charger, 1x charging cableDescription: electric heating socks (long type) 5V mobile power2. With the difference in the measurement method, please allow 1-3cm in size deviation (1cm=0.39 inch).Thank you for understanding!!