Features:Alleviates puffy eyes, sinus pressure, migraines, and allergiesAdjustable strap holds pack comfortably over the eyesFrost free exterior is gentle on the skinStore in freezer, heat in microwaveNontoxic, biodegradable fill maintains therapeutic temperature for 20 minutesTwo surfaces for controlled therapy to ease painVersatile & ComfortableDual Comfort CorPak™ Eye Mask Compress provides hot or cold therapy as a versatile solution to ease pain and help reduce inflammation associated with puffy eyes, sinus pressure, allergies, and migraines. Conveniently store pack in the freezer for cold therapy the moment you need it! This pack stays soft and flexible, comfortably contouring to painful areas. Use cold to ease pain and help reduce inflammation; warm pack in the microwave to aid muscle relaxation and promote healing.Adjustable strap holds the pack in place and keeps hands free, making it easy to rest or relax. The pack's two exterior surfaces offer controlled therapy. The light blue, soft surface quickly provides hot or cold therapy while the plush, dark blue surface slowly provides hot or cold therapy. The Eye Mask Compress pack contains nontoxic, biodegradable fill to retain heat and cold longer.The soft, frost free pack is gentle on skin and does not need to be wrapped in a towel. For cold therapy, place pack in freezer for a minimum of 1 hour prior to use. For heat therapy, simply heat the pack in a microwave according to the heating instructions printed on the pack. The pack will maintain therapeutic temperature for 20 minutes. When not in use, the pack may be stored in the freezer for convenience.