Bullet Points:1, Continuous Heat Retention: The heated insole can maintain about 5 hours of continuous operation. The heating surface damper covers the entire sole, saying goodbye to cold arms and legs in winter.2, Comfortable design: This heated insole is comfortable and flexible. The shoe size range is on the insole, which can be adjusted according to your shoe size, suitable for all kinds of shoes.3, Washable design: The rechargeable battery of the shoe insole is waterproof, washable and reusable. It can be cleaned by brush, but not machine washable.4, Comfortable to wear: The heating pad adopts new carbon fiber heating technology, which is safe and reliable. The soft and comfortable elastic EVA material has the characteristics of lightweight, elastic and good shock absorption.5, Winter gift ideas: These rechargeable insoles are the perfect gift for Christmas, Father's Day, Mother's Day and winter. Nothing is more important than warmth and health in winter. Descriptions: The heating pad is made of soft and comfortable elastic EVA material, which is lightweight, flexible and has good shock absorption performance. Convenient USB port to make the heating pad work through the USB data cable. They can be washed by hand and reusable. It should be noted that it must be dried after washing and must be completely dried before it can be used. The maximum design temperature is 50 deg; c/122 deg; f. Can be used in a way