The Organic waterproof natural quilted fitted portable/mini crib protective mattress pad cover has a top layer of soft organic cotton interlock. Middle layer is 100% breathable polyester, and the back layer is waterproof breathable polyester. The pad measures 24 inches x 38 inches, fits 3 inch to 5 inch portable/mini crib mattresses. Can be machine washed cold with like colors, mild detergent, gentle cycle, can use non chlorine bleach if necessary.