3 ThermaCare - Air-Activated Heatwraps, Menstrual Cramp Relief Patches Therapeutic Heatwraps for Menstrual Cramp Relief. Air-Activated Provides 8 hours of heat 3 Single-use patches ThermaCare is a disposable air-activated wrap that delivers low level, consistent, therapeutic heat for 8 hours. Just open the pouch and these single-use wraps begin to warm up when exposed to air. Made in USA Indications: Provides temporary relief of minor menstrual cramp pain. Directions: Open the pouch only when ready to use. You may put the patch on immediately. Allow 30 minutes for it to warm up. Remove paper. Place adhesive side towards panties.