The Naturepedic Dual Firmness Classic Crib Mattress is made from organic cotton. With 150 coils and an edge support, it provides great comfort for your baby while she's sleeping. This crib mattress has a polyethylene surface that's waterproof for easy cleaning. Plus, it has waterproof seams to prevent moisture from penetrating inside. With square corners, this mattress fits perfectly inside her crib. This JPMA-certified crib mattress is hypoallergenic and nontoxic.