These Individually Wrapped Gentle Oxygen Eye Masks Are Designed For Continuous 8 Hour Use Overnight. They Contain A Natural, Alcohol-Free, Non-Irritating Formula And Are Completely Safe To Use. Each Mask Is Infused With A Potent Blend Of Nourishing Ingredients That Work Hard To Reduce Dark Circles And Puffiness So You Wake Up Looking Youthful, Refreshed And Well-Rested.