Simmons Kids BeautySleep 5 in. Full Size Foam Mattress is firm and lightweight for easy changing. Square corners for a secure fit inside the crib. Hypo-allergenic water resistant vinyl cover is easy to clean. TRIS Free fits 52 x 28 Full Crib sleep surface.. GREENGUARD and CertiPUR-US Certified for a healthy indoor environment. Firm foam provides ideal support for babies rest. Mattress meets or exceeds all federal Flammability Standards with out the use of harmfull chemicals. Natural cotton fire protection wrap has no chemicals is non-toxic and meets or exceeds all federal flammabilty standards.. JPMA Certified also meets CFR 1633 Flammability Standards. Dimension - 52.00 x 28.00 x 7.00 in.. Item Weight - 15.0 lbs.. Size - 5 in.