Adjustable strap: the strap of these sleeping masks are adjustable to fit most head size, and sleeping masks will not slip off from kids' head in the middle of sleep and will not get entangled with hair. Blocking light: these 3D eye mask for kids can fit kids' nose well blocking light from entering, offering your kids a full dark and undisturbed sleeping environment and improving sleep quality. 3D Design: these travel eye masks are deigned with wider and deeper 3D eye area, providing kids with wider space to blink and comfortable to wear and will not pressing kids' eyes. Quality material: these 3D sleep eye masks are made of lightproof, high density foam, breathable and smooth, with delicate craftsmanship, they will not stain kids' bed sheets or pillows. Package content: you will receive 5 pieces eye covers in 5 styles, including solid black, star pattern, cat pattern, gray stripe and solid green, sufficient quantity for your kids' sleeping use.