The Kolcraft Fresh Start Crib and Toddler Mattress have a lightweight yet ultra-firm thermo-bonded fiber core made of all hypoallergenic material. It provides great support for infants and toddlers and passes GREENGUARD GOLD Certification testing for a healthier sleeping environment for babies. There are no added flame retardants and it passes CPSIA testing so there are no sharp points, leads, or phthalates used in this mattress. It is covered in a rich embossed waterproof laminate so no leaky messes will seep inside and easily wipes clean with a damp cloth or a baby wipe! Tested to be 100% waterproof on the surface and lock-stitched edges to help resist stains and odors on baby's bed. Our thermo-bonded fiber core uses a sustainable design since our core is made from recycled water bottles and spun into firm hypoallergenic fibers. The Fresh Start crib mattress fits the U.S. Standard cribs and toddler beds so you can pair them with your favorite crib. The square corners create a snug fit inside cribs. This lightweight and durable mattress pass voluntary ASTM crib mattress standards to help ensure improved safety and quality for babies. Measures 51.63" L x 27.25" W x 5" H for a proper fit in baby cribs and toddler beds. Kolcraft was founded in 1946 and remains a family-owned and operated business today.