Heat Experience Heated Insoles The Core Series Heated Insoles are about more than toasty toes. They are ergonomically designed to give support, have a gel cushion heel for extra comfort and able to be fitted easily into most shoes and boots. Their 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. Our insoles are designed with ventilation holes across the whole insole for optimal air and heat distribution. You can choose between 3 different temperature levels easily operated with a remote control. With multiple and easy charging options, these insoles couldn't be more convenient, unless they did the walking for you. Charge your heated insoles, pair the remote and slide them into your favourite shoes or boots and you're all set for the day. If the nasty cold come creeping, you are just one click away to having a better day. Charger and battery are included in purchase. Features & Specifications: Charge with USB in a power outlet, power bank or in your car Up to 6 hours battery life (extreme cold may alter battery life) Remote control operated Thickness: 7mm heal - 14mm mid - 5mm toe Weight: 120 gram / 4.2 oz (per insole) Shock absorbing Ergonomic design 3 heating levels Integrated battery 2-year warranty Additional Information: Size Heated Insole: Small (35-37), Large (41-43), Medium (38-40), XL (44-46)