AMERICA’S #1 CRIB MATTRESS BRAND: Sealy Baby crib mattresses are America's best-selling brand because the quality, safety and parent-tested and trusted Designs far exceed any other DURABLE & FIRM FOAM: The Sealy Butterfly crib and toddler mattress collection is made with CertiPUR-US certified foams that are firm and supportive 100% WATERPROOF PROTECTION: Features a waterproof barrier to keep leaky messes from seeping into the mattress. Designed with a waterproof barrier to help protect against odors EASY-CLEAN PROTECTIVE COVER: Highly durable laminate cover is reinforced for lasting use through the toddler years. Zip on and off for easy spot cleaning or simply wipe down with a damp cloth SAFETY & QUALITY: Greenguard's gold standard helps to ensure a healthier sleeping environment