Provides heat therapy for temporary relief of minor muscular and joint aches and pains associated with overexertion, strains, sprains, and arthritis. Patented technology for consistent, effective relief. Clinically proven. 16 Hours deep penetrating relief.* #1 Doctor recommended.^ Drug free and odor free. Air-activated, one-time use. Portable & discreet for on-the-go relief. Air activated. One-time use. *8 hours of relief while you wear it + 8 hours of relief after you take it off. ^Among Heatwraps for Pain Relief- IQVIA 2021.