2-in-1 Organic Foam Crib Mattress This mattress features air vents to help keep the mattress fresh and cloth edge binding to prevent seam splitting. Baby will sleep comfortably on this mattress made from a CertiPUR-US ceritified high density soy foam core. The Breath-safe fabric with Nanomesh technology on the baby side helps mattress regulate temperature so baby sleeps comfortable and wakes up refreshed, not hot and cranky. The quilted organic cotton cover on the toddler side is waterproof. Made from premium fabrics and materials, Ikko Organic mattresses are free of Phthalates, lead, and toxic chemicals to keep your baby safe.