100% Polyester DUAL-SIDED CRIB MATTRESS: Crib & toddler mattress is designed to grow with your baby; The smooth, firm side is recommended for the infant stage; Convoluted side is recommended for the toddler stage; Flip mattress from infant to toddler side as baby grows GREENGUARD GOLD CERTIFIED, FORMALDEHYDE FREE CERTIFIED: Certified products are screened for more than 10,000 chemicals and VOCs known to pollute indoor air; Lab tested in environmental chambers and certified by UL to be free from formaldehyde MACHINE-WASHABLE, WATERPROOF COVER: Featuring an ultra-soft, removable, machine-washable outer cover with waterproof sleep surface; Gently unzip outer cover, machine wash in cold water (delicate cycle, no bleach) and hang dry (do not place in dryer) MATTRESS IS READY TO GO, RIGHT OUT OF THE BOX: Graco crib mattress arrives fully expanded, so it’s ready to be placed into your crib or toddler bed right out of the box; Mattress is fiberglass-free, free of chemical flame retardants, and certified formaldehyde-free DIMENSIONS: Fits any standard full-size crib and toddler bed; L (52 in) x W (28 in) x H (6 in); Weight (12 lbs); Mattress core (100% polyurethane foam); Mattress cover (100% polyester); Backed by a 10-year limited manufacturer’s warranty (Mattress Protector Included)