Our portable/mini crib mattress cover features a top layer made with ultra soft polyester; middle layer is quilted with 100% polyester and the back layer is made with waterproof/breathable polyester to protect mattress from any water spills or bed-wetting. This cover measures 24" x 38" x 5". Machine washed cold with like colors, mild detergent, gentle cycle and use non chlorine bleach when needed.