The Six Hour Cordless Heat Therapy Wrap.

This cordless heated back 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, these are powered by a slim, long-lasting lithium-ion rechargeable battery that ensures consistent heat therapy. The flexible, thin wraps can be worn under clothing, they conform to the body without inhibiting movement, and the Velcro fasteners ensure they remain in place. Virtually undetectable carbon fiber heating elements adjust from 108º F to 130º 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.