Introducing the Graco Premium Foam Crib and Toddler Mattress — America's #1 Crib Mattress (Based on dollars sold, according to 2019-2022 market data compiled by The Npd Group). Greenguard Gold Certified, Formaldehyde Free Certified by Ul, Jpma Certified, and with a CertiPUR-us Certified foam core. Proud recipient of the 2023 Top Product Award by Parent Tested Parent Approved (PTPA), the PTPA Seal of Approval, the 2020-2023 Women s Choice Award for “9 out of 10 Customer Recommended Crib and Toddler Mattress” and National Parenting Product Awards (Nappa) winner. Features a removable, comfortably soft mattress cover with a waterproof sleep surface. For easier care, this zip-off mattress cover is machine-washable (machine wash in cold water on delicate cycle, hang to dry – do not place in dryer machine). The mattress foam core is perforated to allow for increased air flow without compromising on firmness.