Serta’s Perfect Embrace 3" Mini Crib Mattress was designed with your baby’s health, safety, and comfort in mind. It delivers all the benefits of a full-sized crib mattress in the convenience of a smaller size to fit mini cribs and portable cribs. The fiber core made from recycled materials delivers a firm yet lightweight sleep space while the waterproof vinyl cover helps prevent mold, mildew and odor. Fits most mini and portable cribs (not designed for standard cribs or pack ’n plays). All Serta crib mattresses are GREENGAURD Gold Certified and meet the strictest standards offered by the Green guard environmental Institute, which recognizes products with low chemical emissions, contributing to improved indoor air quality.