The eyes have it (Yes, you must have this!) The plant-based cooling phase change material cools to a comfortable 58 degrees and provides soothing relief for puffy eyes, swelling and cosmetic treatments. The Opal Eye Mask also relieves headaches and migraines and cools fevers. Refreshes to a cool state in the refrigerator after just 20 minutes. Stays cool approx. 30-45 minutes. Latex-free and made in the USA! To clean, wash with mild soap and water then air dry.