heat insoles manufacture 1.health care for feet ,therapy 2.,heated with ... charger.With a pair of calf wraps to fix the insoles.Advantages:1. Long working time Heated by powerful Li-on ... towel.6. Adjustable sizeYou can adjust the size of the insoles by cutting it along the white line on the insole ... , alleviate pain and eliminating inflammation.certification shows HSP-75D heat insoles manufacturer