Dimensions: 28L x 52W x 9H in.. 100% cotton outer, 100% polyester backing construction. White quilted fabric for plush comfort. Waterproof backing protects your mattress. Elasticized corners provide a snug fit. Machine-washable. Protect their crib mattress from accidents by surrounding it with the Quilted Waterproof Crib Mattress Pad Cover American BaCompany by American Baby Company. This mattress pad features a waterproof polyester backing with a soft cotton topper for ultimate comfort. The elasticized edges allow this pad to fit around up to a 6-inch mattress with ease.