1 Pair Heated Insoles Winter Unisex Heated Shoe Inserts USB Charged Electric Insoles for Shoes Boot Keep Warm with Fur Foot Pads Features: Super soft velvet, extremely warm for chilling days. Heating is convenient with USB interface. Exquisite processing ensures soft and comfortable touch feeling. 11-core copper wire is more secure to use. High technology carbon fiber heating material. Description: Delicate sewing provides long service life. Washable, no harm to heating material. Suitable for both men and women. Specifications: Material: super soft velvet Color: dark brown Power supply: USB interface Voltage: 5-6V Size: 37-38 39-40 41-42 International Size: 235-240 245-250 255-260 US Size: 5.5-6 6.5-7 7.5-8 UK Size: 4.5-5 5.5-6 6.5-7 Feet Length(mm): 235-240 245-250 255-260 Feet Length(inch): 9.25-9.45 9.65-9.84 10.04-10.24 Package Included: 2 x USB Heating Boot Insole 1 x USB Cable 1 x User Manual Notes: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures. 2. Due to different personal measuring techniques, there might be 1-3cm error of the physical. Thank you!