When exposed to air, an oxidation process that generates heat occurs. It provides LONG-LASTING, comfortable, even heat. The insole is ultra-thin and comfortable, ensuring that your entire foot stays warm. The heated insole is designed for a restricted air environment and does not require any electrical energy.
Surface texture design is NON-SLIP.
Insole built-in activated carbon, iron powder, constant temperature stone.
Rapidly warming up to 40 degrees Celsius in 15 minutes and reaching a maximum temperature of 53 degrees Celsius.
Long-term effect and durable,provides reliable, evenheat for up to 12 hours. Keep warm and keep healthy.