SAFETY TESTED CRIB MATTRESSES: Sealy crib mattresses are GREENGUARD GOLD Air Quality Certified, meet or exceed state and federal certifications. No toxic fire retardants. Expertly made in the USA using certified materials including American-made foams. 2-STAGE DUAL FIRM MEMORY FOAM COMFORT: Grow-with-me firmer infant baby mattress flips to a toddler bed comfort side. American-made cool gel topper for ultimate comfort. Lightweight 12 lbs. for easy sheet changes. Uses standard crib mattress sheets. BREATHABLE COTTON COVER & WATERPROOF BARRIER: Breathable baby mattress cover with waterproof barrier to protect baby's mattress. Durable cotton fabric surface creates breathability and moisture wicking comfort. Airflow pocket helps baby mattress breathe. GENTLE, SUSTAINABLE: Extra firm baby mattress with sustainable fiber core keeps newborns and infants supported. Family-friendly CertiPUR-US Certified cool gel memory foam topper offers premium comfort for babies and toddlers without any harsh chemicals. BABY CRIB MATTRESS PERFECLTY FITS: Standard full size crib mattress fits all standard cribs and toddler beds-(measures 51.7 x 27.3 x 5.25). Lifetime warranty on workmanship and materials, backed by Sealy Baby the most trusted crib mattress brand.