3-d Mesh Spacer ULTRA-BREATHABLE: Take comfort knowing our breathable crib mattress protector pad is the ideal solution for potty training or adding an extra layer of comfort to your crib mattress. Our utra-thick breathe-thru spacer layer adds 3/8” of air circulation over the waterproof layer, making it one of the only breathable yet still waterproof pads available. Fits any crib mattress, 52 x 28 inches. 100% WATERPROOF: Our waterproof lining preserves and protects your baby’s mattress from moisture, leaks, and potential mold, so you can feel secure that your crib mattress remains clean and healthy even when accidents happen. MACHINE WASHABLE: Designed with convenience in mind, the breathable crib mattress pad is machine washable, allowing you to quickly and readily clean up any mess without the need for harsh chemical detergents, making it the perfect choice for busy parents and babies! GREENGUARD GOLD and PROVEN: Our crib mattress pad is independently tested and certified, exceeding the highest industry emissions safety standards. And in a third-party accredited laboratory, tests showed that a baby gets 97% more air while breathing through a Newton Crib Mattress Pad than on a conventional waterproof crib mattress.