Specification:This is a high quality electric shoe inserts. Super thin design with maximum flexibility, distributes heat evenly to the substrate . With a pair of hot foot pads, you are no longer afraid of cold.Features:Uniform heat generation, high heat conversion efficiency, rapid heating, soft and comfortable.Easy to use, just put in the shoes and connect the power to enjoy the warmth.Soft and comfortable, with exquisite workmanship.Super thin design with maximum flexibility, thickness is only 4mm.Distributes heat evenly to the of heat insoles.Adopt water- material, which could be washed directly. More convenient and clean.According to the cutting line, the insole can be cut according to your shoes.It is suitable for most shoes.Specification:Item Type: USB Heated InsolesMaterial: EVA Elastic FiberColor: As Pictures ShowTemperature: Approx. 40-50℃Voltage: 5V / 2AOptional Size: 35-39, 41-46Weight: Approx.Package List:1 x Pair of Heating Insoles1 x Adapter1 x USB CableNote:It must be energized during use to achieve continuous heating.