With heating imines film inside the pad.
Just need 30 seconds to warm up.
Semi-conductor electric chips, fast warming and insole temperature could be controlled in 38 to 50C
Use DC 3.7V Lithium Battery for rechargeable, free from electromagnetic radiation
Unique kneepad design for better use.
With a pair of calf wraps to fix the insoles.

Functions:
1. Keep warm in winter, keep away from coldness.
2. Therapy function

In addition to heating, the FIR energy has also therapy function. By absorbing the energy eradiated by Far Infrared Ray, it will promote the blood circulation in your body and therefore accelerate the metabolism in your body, alleviate pain and eliminating inflammation.
Your inquiry will be appreciated anytime!