Air-activated therapeutic heat; lasts at least 8 hours. Comforts and soothes; provides powerful pain relief. Penetrates and relaxes tight muscles; increases circulation. 3 ultra-thin wraps; can be worn under clothing. Please read all label information on delivery Pack of Twelve, 2 Count (Total of 24 Counts) Air-activated therapeutic heat; lasts at least 8 hours Comforts and soothes; provides powerful pain relief Penetrates and relaxes tight muscles; increases circulation 2 ultra-thin wraps; can be worn under clothing, Please read all label information on delivery