About this subject 【Soft and comfortable】 These heated inserts with a slim design and a thickness of only 4 mm provide maximum flexibility and distribute heat evenly across the supporting surface. Heating at high temperatures from 40 to 55 degrees not only protects your feet from the cold winter, but also promotes blood circulation. 【Washable and repeatable use】 - This USB insert material has a waterproof effect, can be washed and reusable, can be washed with a brush, not machine washed. Please note that after washing it should be dried and completely dried before use. Tips: It needs to dry completely before use, and when connecting USB power, keep the USB port away from water. 【Cutting capability】 Heated insoles can be cut according to shoe size, suitable for all types of shoes, 35 - 44, shoe size range is indicated on the insoles for DIY convenience, heated insoles are 5mm thick, no need to worry about size, there are marked lines on the insoles, easy to trim. 【 Wide application possibilities and the best gift】 - the cable provided is 1,5 m long, which allows you to insert it into your pants when connected to a power bank, so you can warm your feet even when walking or working outdoors, it can also be used in front of a computer in the office or at home. .