1,With built-in micro heater chip, heat quickly and evenly, long service life. 2,Allowing cleaning with water for recycled use, but keep the interface out of the water. 3,Provided with 1 pair of size reference sheet, you can cut arbitrarily according to the size number as your required. 4,One USB cable connects the laptop or computer to heat 1 pair of insoles at a time, keeping your feet warm all the time. 5,Very good accessory for computer workers on cold winters. Fit for all kinds of shoes. Features: With built-in micro heater chip, heat quickly and evenly, long service life. Allowing cleaning with water for recycled use, but keep the interface out of the water. Provided with 1 pair of size reference sheet, you can cut arbitrarily according to the size number as your required. One USB cable connects the laptop or computer to heat 1 pair of insoles at a time, keeping your feet warm all the time. Very good accessory for computer workers on cold winters. Fit for all kinds of shoes. Specification: Condition: 100 percent Brand New and High Quality Material: Short Fluff and EVA Brown Men Size: 39-44 Heating Chip Length: Approx. 17 cm or 6.69 inch USB Cable Length: Approx. 1.6 m or 5.24 feet Quantity: 1 Pair Weight: Approx. 108 g Packing List: 1 x Pair of Heating Insoles 1 x 1.6 m USB Cable 1 x Pair of Size Reference Sheet Note: It has warm function only if it is powered by connecting USB cable to the computer, laptop or other available appliances. Once power off, there will be no temperature. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. YJL official store