Improve sleep: the breathable, natural fiber lets in healthy oxygen while keeping dry air out, making the sleep mask suitable for people with insomnia or dry eyes. It can also provide you with a quiet environment to help you fall asleep faster and deeper than before. Effectively blocks light: the eye mask can completely cover your eyes, and the padding at the bridge of the nose on the inside can block all light to ensure you sleep completely, whether you are at home, in a hotel or on the plane. A nice travel accessory that helps you feel rested and refreshed. Adjustable strap: comfortably fits all head sizes with adjustable buckle and strap. The strap has been extended to increase the adjustable range to fit almost all head sizes, fully adjustable strap from 39 cm to 54 cm (flexible, maximum range can be increased), suitable for women/men/children/back/side/stomach sleepers. Silk and soft fabric: made of quality silk material which is a type of porous fiber that has good hygroscopicity and moisture permeability, soft, light, breathable and comfortable to wear, helping to release stress on your eye areas. Packaging and size: 4 pieces of silk sleep mask in different colors, each measuring 20 x 10 cm, sufficient quantity for personal use, and you can share some with your family members or friends as a nice gift, giving them deep, uninterrupted sleep.