The Kolcraft Fresh Start PolyFoam Crib Mattress is a lightweight foam-core crib mattress with an easy clean, waterproof cover. A fresh start to the day begins a good night's rest. The Kolcraft Fresh Start Polyfoam crib mattress will give your baby sweet dreams day or night. The lightweight foam-core provides optimal firmness for your baby with a polyester core made from sustainable resources. This lightweight foam option makes it easy to lift and change sheets. A square corner design provides a snug fit inside cribs. The durable embossed PermaDri cover is waterproof and stain-resistant, keeping odors and allergens at bay. All Kolcraft crib mattresses pass ASTM crib mattress standards and are Greenguard Gold Certified. Greenguard Gold standard means the entire mattress and components have been tested for air quality and pass strict chemical emission testing to help ensure a healthier sleeping environment for babies. All Kolcraft crib mattresses pass all state and federal testing without lead or phthalates. Kolcraft baby crib mattresses are proudly made in the USA of the highest quality U.S. and imported parts. 5 year warranty on workmanship and materials. It fits USA standard size cribs and toddler beds.