Dream On Me, Star-Burst 3" Spring Coil Portable and Mini Crib Mattress is designed to provide supreme comfort and support as a full-size crib mattress. This portable/mini crib mattress features interwoven steel coils that are wrapped in polyurethane fiber and protected with a waterproof cover with a Lock Stitch cover. This mattress is proudly constructed of quality materials and workmanship in the USA. 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 sunshine mattress fits most mini and portable cribs (not designed for standard cribs or pack 'n plays).