Kool 'n' Soothe Migraine Soft Gel Sheets Kool 'n' Soothe Migraine Soft Gel Sheets provide immediate cooling relief for migraines & headaches & last for up to 8 hours. These convenient sheets are a modern alternative to the wet flannel method, lasting much longer & ready to use with no refrigeration required. As Kool 'n' Soothe Migraine Soft Gel Sheets are non-medicated, they can be used with pain relief medication for maximum comfort & are safe to use during pregnancy. For best results, Kool 'n' Soothe Migraine Soft Gel Sheets should be applied at the first sign of migraine or headache. Once finished with, they can be removed easily without leaving any sticky residue. Kool 'n' Soothe Migraine Soft Gel Sheets contain a high percentage of water which works with the body's natural cooling system helping to cool the body. As the temperature rises, the heat of the skin causes the evaporation of water contained within the sheet, resulting in a cooling sensation on the surface of the skin. The unique structure of the gel disperses heat freely, allowing excellent heat transfer ability & maintaining a constant & steady cooling effect.