The Newton Crib Mattress Pad adds waterproof protection for your crib mattress and breathe-thru protection for your baby. With a 3/8" of air circulation on the surface of the mattress, your baby will sleep safer, cleaner and more comfortably. GreenGuard Gold certified and proven in independent testing to reduce the risk of suffocation. Universal fitted skirt with mitered corners to fit any standard crib mattress.