Greenbuds 100% Organic Cotton Mattress Pad is the purest you can get, with the properties of a "Waterproof" Mattress Protector with no vinyl, PVC, Phthalates, or any other potentially hazardous chemicals. Outer fabric consists of 100% Organic Cotton, with organic cotton fill as well. For waterproofing we use a Food Grade Polyethylene waterproof membraine. Mattress Pad is quilted for added comfort and protection, and sewn with deep pockets that fit securely over any standard crib mattress. Size: 28" x 52"