The Little Dreamer 100% Premium Cotton Crib Mattress Cover is a plush, luxurious mattress cover made with premium cotton.This premium cotton blend (including 30% organic cotton) will be directly under your baby, offering a soft lush surface under your sheet. The hypoallergenic, nontoxic waterproofed back will protect your baby’s mattress and make cleaning the crib after an accident a breeze. Sides are mitered and fully finished to hold tight onto any standard U.S. sized 5″ or 6″ deep mattress. Elasticized bottom makes changing the cover incredibly easy. Breathable, smooth sides keep your crib looking neat and allow air flow throughout your baby’s crib environment.Machine wash/dry.