This cordless, heated shoulder wrap provides up to six hours of deep-penetrating heat therapy to relieve sore, stiff muscles and joints without requiring proximity to an AC outlet. Unlike other wraps that quickly lose their heat, this one is powered by a slim, long-lasting lithium-ion rechargeable battery that ensures consistent heat therapy. The flexible, thin wrap can be worn under clothing, and it conforms to the body without inhibiting movement; the Velcro fasteners ensure it remains in place. Virtually undetectable carbon fiber heating elements adjust from 108° F to 130° F at the touch of a button on the battery pack. Lasts up to 2 1/2 hours on the highest setting. Recharges via AC in four hours.