Powerful pain relief for up to 8 hours. Deep muscle relaxation. Ultra-thin and odorless. Air-activated. One-time use. Compare to ThermaCare (This product is not manufactured or distributed by Pfizer, Inc, the distributor of ThermaCare). Air-Activated: Just open pouch, starts to warm on its own. 8 hours of pain relieving heat: long-lasting relief. Ultra-thin, comfortable, discreet, odorless. Relaxes Tight Muscles: reduces pain with natural heat. Contact us at 1-877-932-7948, or www.supervalue-ourownbrands.com. Made in China.