Serta's Perfect Sleeper Deluxe Crib Mattress Pad provides comfortable support in addition to your baby's crib mattress to ensure a good night's sleep. The Serta Perfect Sleeper Deluxe Crib Mattress Pad features: 100% Cotton Quilted Top 100% Waterproof Underside Machine Washable PVC and Phthalate free Plush 4-Ply Comfort Elasticized borders Measures 52 in. x 28 in. to fit over a standard size crib mattress.