This Kolcraft Goodnight Baby Crib Mattress fits both standard size cribs and toddler beds so you can use it for years. This firm, comfortable mattress has 120 innerspring coils and 2 layers of cushioning on each side. The waterproof cover is treated to be stain-resistant and hypoallergenic. This baby mattress is GREENGUARD? Gold certified to help create a healthier sleeping environment for your baby.