1. This is a portable rechargeable heated insoels. Built-in lithium battery module. 2. High capacity batteries offer 8-9 continuous hours of runtime with fully rechargeable Batteries. Warming time is varies in different environment. 3. The heated insoles is made of elastic EVA-foam, it soft and comfortable. 4. Made of carbon fiber heating material, high conversion rate, saving power. 5. Adopt waterproof heating material, the insole is washable, you can wash it via brush, not for machine washing.
