Infants need a firm foundation, and Serta’s Nightstar Deluxe Firm Crib and Toddler Mattress provides the support essential for a good night’s rest. Other features include: full perimeter border support for long-lasting stability, air vents that help the mattress breath and keep it fresh, plus a waterproof vinyl cover for easy cleanups. All Serta crib mattresses are GREENGUARD Gold Certified and meet the strictest standards offered by the GREENGUARD Environmental Institute, which recognizes products with low chemical emissions, contributing to improved indoor air quality.