Features ADJUSTABLE SHOULDER STRAPThe shoulder strap can be adjusted within 32-65cm. You can adjust the length according to your needs. There are two sizes for adults and children, you can choose according to your needs, suitable for adults and children, left eye and right eye. COMFORTABLE MATERIALOur eye mask is made of soft and breathable polyester material, which is comfortable to wear, smooth and durable. Wear-, will not harm your eyes, safe and comfortable material, can be used for a long time. 3D DESIGNOur eye mask is designed with 3D grooves, so it won't touch your eyes, won't make your eyelids and eyelashes feel uncomfortable, comfortable to wear, won't oppryour eyes, give your eyes enough space, very humane change. EYE CAREOur eye mask protects the delicate eye area without irritating or touching the eyelids and eyelashes, suitable for eye training, surgery recovery period and daily use, the eye mask material is soft and breathable, perfect for comfort. WIDE APPLICATIONSThe eye mask is suitable for treating amblyopia such as strabismus, amblyopia, diplopia, and people whose eyes are sensitive to light, tired, and photophobic after eye surgery. It can also be used for cosplay and pirate camouflage as well as everyday reading. Specification: Material: polyester Color: black,blue Size(approx.): (L x W) adult size 7.5 x 7cm/2.95 x 2.76inch child size 6.5 x 6cm/2.56 x 2.36inch Package Included: 4 Pcs x Eye Patches(adult size/2pcs,child size/2pcs) Note: 1.Due to the light and screen difference, the item's color may be slightly different from the pictures. 2.Please allow 1-2 cm differences due to manual measurement.