high quality Adjustable Strap: Suitable for all sizes of heads, equipped with adjustable buckles and straps, extended adjustable range to fit almost all sizes of heads, fully adjustable strap from 15.3" to 21.3" (flexible, maximum range can be increased), suitable for women/men/kids/back/side sleepers Silk and Soft Fabric: Made of high-quality silk material, which is a porous fiber with good moisture absorption and breathability, soft and lightweight, breathable and comfortable, helps relieve eye pressure. Effectively block light: The eye mask can fully cover your eyes, the padded fabric on the inner nose bridge can block all light, ensuring you sleep well at home, hotel or plane, beautiful travel accessories help you feel rested and refreshed. Packaging & Size: 4 pieces of silk sleeping eye masks in different colors, each piece measures 7.87 x 3.93 inches/20 x 10 cm, enough quantity for personal use, you can share some with your family or friends as a wonderful gift, let them fall into a deep and uninterrupted sleepImprove Sleep: Breathable natural fibers allow healthy oxygen to enter while preventing dry air from entering, which makes the sleeping eye mask suitable for insomnia or dry eye patients, it can also provide you with a quiet environment to help you fall asleep faster and more deeply.