The Twinkle Stars Limited Recycled Fiber Core Crib and Toddler Mattress by Delta Children provides your little one with the support and comfort they need each night. The firm support comes from the high-density thermo-bonded fiber core that's made from 300 recycled water bottles. This baby mattress is also incredibly lightweight, which makes it easy to change the sheets, maneuver or flip. Topped with a waterproof vinyl cover that keeps the mattress clean and square corners to help create a secure fit inside a crib or toddler bed, this 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.