Polyurethane Our Waterproof Pack N Play Sheet Set features an eco-friendly waterproof TPU lining (Thermoplastic Polyurethane), designed to create a barrier between your mattress and any leaky messes or spills. Our waterproof lining ends the need to pack an added mattress cover for your Pack N Play when traveling or dropping your little one off at daycare. We designed a 100% Jersey Knit Cotton wall, reinforced with a flexible elastic band so you can be rest assured that your baby is safe, snug, and sound. Our portable crib sheets\u2019 innovatively designed elastic band offers a flexible fit while supplying a safe and secure, snug fit to playard and mini crib mattresses. The comfort of our soft and breathable, lightweight, 100% Superior Quality Combed Jersey Knit Cotton creates a buttery soft sleeping surface for your baby to sleep on. This convenient two-pack features modern classic, abstract stripes, and splashes patterns, designed in an exquisite Taupe to complement baby boy and girl\u2019s nursery dcor. You can be rest assured that your baby\u2019s sleep surface will always be covered and protected with a clean, stylish, and soft cotton sheet with this two-pack! Featuring a fully elasticized, flexible fit design our sheets are designed to protect standard-sized Pack n Play, Mini Crib, Portable Crib, and Playard mattresses including Graco Pack n Play, Dream On Me Playard, Dream On Me 3\u201d and 5\u201d Mini/Portable Crib Mattress. Please note that this size is not recommended for the Graco Travel Lite Crib, however our Waterproof Changing Pad Cover offers a perfect fit. Actual Dimensions: 39\u201dx 27\u201d x 5\u201d Since our waterproof sheets double as a mattress protector, they make for an easy clean up after the occasional accident. Simply pull the pack n play sheet right off the mattress and throw it in the washing machine. Our sheets are machine washable and should be tumble dried on low.