About this itemHeating Elements Covers Full Foot Area - High-quality heating elements to keep the foot at an ideal temperature. The temperature can reach up to 158 °F to warm cold feet in winter without too hot to sweat. Improves blood circulation for individuals.Give you a warm winter. Lithium-Ion Battery powered with 3-level heat regulator. Power: Li-Ion Battery 2600mAh, 3.7 V.Safe and High Quality Materials - The insole is made of soft velvet upper and the latest carbon fiber heating material. Folding without deformation, lightweight, flexible, with good cushioning, reusable and washable. The heated insoles has a built-in temperature sensor and safety control chip, it will automatically stop heating when it reaches a safe temperature. Safer and provid.
eBay