Delta Children’s Glimmer Stars Crib and Toddler Mattress offers your baby or toddler support and comfort at a great price. Built with a firm polyester fiber core, this sturdy mattress is has a durable waterproof cover for easy cleanup. Finished with square corners to help create a secure fit inside a crib or toddler bed, the Glimmer Stars Crib and Toddler Mattress is the ideal choice for your growing child.All Delta Children crib mattresses are GREENGUARD Gold Certified and meet the strictest standards offered by the GREENGUARD Environmental Institute, which recognizes products with low chemical emissions, contributing to improved indoor air quality.