Specifications:NameUSB Charging Heated Shoe InsolesUpper materiacomfortable,soft fleece ColorBlackVoltage 5V to 6VWash and carehand washing by water, after washing,should be dry completely then useSizeThe insoles size is CN SIZE35-36 (230mm/9.06 inch)37-38 (240mm/9.45 inch)39-40 (250mm/9.84 inch)41-..