Dream On Me, Holly 3” Fiber Portable Crib Mattress softly cradles your baby for comfort the inner core is constructed with extra firm Eco-fiber for an inviting, comfortable, environment for your sleeping baby. The waterproof cover aids in keeping the mattress dry and fresh. The mattress is easy to maintain and easily wipes clean with warm water and mild soap. This mattress is proudly constructed of quality materials and workmanship in the USA. Lead and phthalate tested this mattress passes the Federal Standard Flammability Standard 16 CFR 1633. Designed to fit a standard 24” x 38” Portable/mini-Crib. As parents are looking for more space-saving furniture mini and portable cribs are ideal for apartment/ smaller homes and Dream On Me Holly mattress fits mini and portable cribs (not designed for standard cribs or pack 'n plays).