Electric Heating Insole 1.  Unisex Smart Heating Insole . 2. Stretchy nylon + PU + Flannelette material 3.  Safety, waterproof, fast heating, soft and comfortable. 4.  Foot heating design, lasting warmth 5.  Two operating modes, manual switch and remote control 6.  Three gears temperature adjustable 7.  Available in four size segments from 35 to 46 8.  The plastic battery case and Titanium alloy stand support 500kg to protect the built-in battery 9.  Customer tailered design and development service is available.