Foster healthy sleep for your babe with the Pure Core crib mattress with a hybrid waterproof quilted cover. Combining two covers into one, the hybrid cover protects your crib mattress with a non-vinyl waterproof backing and features a soft cotton face for baby's comfort. For your peace of mind and babe's safety, all Babyletto mattresses are GREENGUARD Gold certified, hypoallergenic, and free from chemical flame retardants.