The Simmons BeautySleep 4 in. Foam Mattress - Daycare-Porta Crib has everything needed to give your little one his or her valuable beauty sleep on a nightly basis. Certified by GREENGUARD, the 4-inch foam mattress is guaranteed to provide the safest possible environment for your baby by meeting the highest standards for clean air quality and materials. The mattress"s hypoallergenic waterproof vinyl cover is easy to clean. Just as you would expect from every Simmons mattress, the BeautySleep Naturally Sunny Day mattress offers comfort, support, and durability for years of performance, helping your baby sleep through the night every night. Dimensions: 24W x 4D x 38H inches. **For a proper fit, please check the crib manufacturer’s instructions for mattress sizing and maximum mattress thickness. When the mattress support is in its lowest position, the height of the sides of the crib must be a minimum of 20 inches from the top of the non-compressed mattress pad to the top of the side rail when the side rail is in its highest position or the gate rail is in the fully latched position.** Simmons Kids: The Natural Choice for Mom and Baby From a company equated with a good night"s sleep come the same high quality products geared for babies and kids. Exciting lines and collections offer the latest and enduring styles for the nursery and the years beyond. Convertible cribs, beautiful dressers and chests, and everything else you can imagine for the nursery is well-crafted by Simmons. Best of all, every piece of Simmons Kids Furniture meets or exceeds federal safety standards. * 4-inch mattress with superior firmness for baby and toddler * Lightweight but high density makes for easy changing * 100% natural cotton fire protection wrap has no chemicals * Easy-clean hypoallergenic waterproof vinyl * Certified for a healthier indoor environment * Dimensions: 24W x 4D x 38H inches