TIPPS: We recommend that you wash your eye masks every one to two weeks. It is better to hand wash and dry naturally to ensure the longest possible life of 100% natural silk. BLACKOUT: The high-density silk and the unique "cloud curve" can not 100% guarantee that no light will pass through, in fact, no material or design can give such a guarantee. But what we can guarantee is a perfect night's sleep, day or night. ADJUSTABLE VELCRO STRAP: You can freely adjust the fit of the eye mask to give you the most comfortable experience. PERSONALIZED DESIGN: We have taken the shape of a cloud and increased the size of the eye mask, while at the same time designing a "cloud curve" for the eye mask to ensure that it does not put any pressure on your skin and that it prevents any light from entering. 100% REAL NATURAL SILK: This eye mask is made in an eco-friendly studio using natural 19mm premium silk on both sides. It protects your skin and hair from friction and gives you a silky smooth night's sleep.