Keep your toes toasty and your feet functional the Fieldsheer® Heated Insoles are a savior for those who suffer from cold extremities. Featuring Odorsheer™ antibacterial construction that resists odors, as well benefits from a moisture-wicking high-stretch fabric to pull sweat away from the skin. These Heated Insoles use ultra slim Lithium-Ion batteries that power ultra-fine heating elements designed to provide instant heat on demand.