The New Bluetooth Controlled Heated Insoles are about more than toasty toes. Get full control and overview of heat settings, battery level and heat time with the new HeatX App. They are ergonomically designed to give support, have a gel cushion heel for extra comfort and fits easily into most shoes and boots. Thin, rechargeable, integrated battery means you'll never have to worry about forgetting them or dealing with cables to an exterior battery pack. Feet need good breathability for comfort and health, and our insoles are designed with ventilation holes across the entire insole for optimal air and heat distribution. With multiple and easy charging options, these insoles couldn't be more convenient, unless they did the walking for you. Charger and battery are included in purchase Features Charge with USB in a power outlet, power bank, or in your car Up to 7 hours battery life Remote control operated Thickness: 7mm heel - 14mm mid - 5mm toe Integrated and rechargeable 1500 mAh battery Shock absorbing materials Ergonomic design 3 heating levels Weight: 120 gram or 4.2 oz per insole Size Heated Insole: Small 35-37, Large 41-43, Medium 38-40, XL 44-46