Dream On Me, Aster 1.5” Fiber Portable/Mini 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, hypo-allergenic, antibacterial, cover aids in the prevention of mold, mildew and odor and easily wipe clean with warm water and a mild soap. This mattress is proudly constructed of quality materials. 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 home and Dream On Me Aster mattress fits most mini and portable cribs (not designed for standard cribs or pack 'n plays).