1. adjustable: Night Eye shades is design to fit head size. Flexible and durable to surround your head comfortably, strap high elastic and easily to adjust, will not catch your hair. 2. Blackout: Unique 3D contoured feature, prevent any type of light, a protective curve with effective space, not touch your eyelids and eye makeup, no pressure on eyeballs,your eyes freely. 3.Lightweight and breathable material: Smooth fabric let you release your facial stress and help you get into sleep rapidly. Our sleeping masks are stronger than traditional blindfold, and will not fall apart easily. 4.Both bevel side design: Reduce pressure on the temples, perfect for side sleeper. High quality sponge, never deformation and no smell, skin-friendly and soft, increases your sleep desire.