The Breathable Baby Buried Treasure Fitted Sheet is made to fit a standard size 28 inch x 52 inch crib mattress. It's breathable comfort helps keep your baby comfortable, dry and just at the right temperature. Made with their signature performance fabric that removes moisture up to 10X better than other fabrics, it takes heat and moisture away from the body, keeping your baby at a perfect comfort level. It features elastic all around for a snug fit. The sheet is made of 100% polyester performance fabric. Care instructions: machine wash warm in gentle cycle with like colors, use NON-chlorine bleach only if needed, tumble dry low.