12 Hours of Heat Patented Heat Cells Penetrate Deep Deep penetrating heat Relaxes tight muscles Long lasting pain relief Air activated, One-time use Targeted Heat Therapy Single use wraps can be applied to sore muscles and joint areas of your neck, shoulder, upper back and wrist. Provides temporary relief from minor muscular aches and joint pains associated with overexertion, strains and sprains, as well as minor pain associated with arthritis. Allows you to move freely while delivering therapeutic heat to relax tight muscles. Thin enough to wear discreetly under clothing. Flexible enough to be worn on the move, during chores or while relaxing.