Adjustable strap: fits all sizes head comfortably with adjustable buckle and strap, the strap has been lengthened to increase the adjustable range to fits almost all sizes of heads, fully adjustable strap from 15.3 inches to 21.3 inches (flexible, maximum range can be increased), suitable for women/ men/ kids/ back/ side/ stomach sleepersEffectively block out lights: the eye mask can fully cover your eyes, and the padding fabric at the bridge of nose in the inner side can block out all light to make sure you sleep in total whether at home, in a hotel or on the plane, nice travel accessory to help you feel rested and refreshedSilk and soft fabric: made of quality silk material which is a type of porous fiber that has good hygroscopicity and moisture permeability, soft, lightweight, breathable and comfortable to wear, helping to release stress on your eye areasImprove sleep: the breathable, natural fiber allows healthy oxygen in while keeping dry air out, which makes the sleep eye cover suitable for insomnia or dry-eye sufferers, it can also provide you with a quiet environment to help you fall asleep faster and deeper than beforePackage and size: 4 pieces silk sleep eye mask in various colors, each measures 7.87 x 3.93 inch/ 20 x 10 cm, enough quantity for personal use, and you can share some with your family members or friends as nice gift, bringing them deep, uninterrupted sleep