Our luxury sateen cotton mattress pad provides ultimate comfort while protecting your crib mattress. The 250 thread count sateen cotton surface and 100% cotton filling will ensure the highest level of comfort for your child. The ultra thin, breathable, knit anti allergen barrier will protect against dust mite of less than 1.0 microns. Our patented extra deep sides stop the pad from slipping off the thickest mattress. Sized to allow for shrinkage. A precision testing has been conducted by independent laboratories to the international standard ASTM F316-86. Machine washer and dryer friendly.