Soothe your lower back and hip area with ThermaCare Lower Back & Hip Heat Wraps. Targeted Heat Therapy Specially designed to fit your lower back and hip area Provides temporary relief from minor muscular aches and joint pains associated with overexertion, strains, and sprains, as well as minor pains associated with arthritis Allows you to move freely while delivering therapeutic heat to relax tight back and hip muscles Thin enough to wear discreetly under clothing Can be worn on the move, during chores, when relaxing, or overnight. How It Works Heat-generating ingredients (iron, charcoal, table salt, and water) warm up when exposed to oxygen in the air, providing natural heat. Wrap begins to warm immediately upon opening, reaching its therapeutic temperature within approximately 30 minutes. Can be used up to 8 hours a day, 7 days in a row (when used as directed).