This is the rechargeable heated hand warmer used by professional golfers on the course in cold weather and crisp early morning tee times. It uses a built-in heating element of virtually undetectable wires to provide fast and concentrated warmth for up to 12 hours. Ideal for other outdoor activities such as hunting, fishing, or camping, the warming pouch has a water-resistant shell, 100% soft polyester interior, and cinch cuffs that help seal out cold and dampness. Secures around the waist with an adjustable strap. Machine wash, hang dry. Its Lithium battery removes from a zippered pouch and recharges via USB.