Currently the best heated insoles on the market are Thermo Soles by Verseo. They make use of a Lithium-Ion battery that is fully rechargeable. The Lithium-Ion battery is commended because it is safer than many of the competitors batteries. It is leak proof and contains no pollutants for the environment. These type of batteries are also very light and thin. They are very small yet just as powerful as other Li-On batteries.
A great thing about Thermo Soles heated insoles is they do not contain bulky wires. Wires often get in the way of your foot space and can be uncomfortable to walk on. A the ends of the Thermo Soles are sockets where they are charged before use. You simply plug each Thermo Sole into an adapter and charge them for 2 hours after regular use. There is no risk of over charging the batteries.
The heated insoles actually monitor your foot’s temperature with integrated thermostats. If your foot temperature ever falls below 31 degrees Celsius then they work to get the warmth you need right when your foot starts to become cold. The heated insoles work until they reach a temperature of 41 degrees Celsius.
Because of these reasons the Thermo Sole heated insole is currently the best on the market. Most heated insoles contain bulky wires and are uncomfortable to the user. With the Lithium-Ion battery it is a tiny solution to give your foot more space. And it still contains the power to keep your foot warm and comfy for a long period of time.