Designed to help your little one catch the comfiest of comfy Zzz's, it's the Dream On Me Baby Zzz 5" Foam Crib & Toddler Bed Mattress that's constructed of quality, fireproof fiber. Made to fit a full-size crib, it delivers a plush yet firm foam sleeping surface for your baby that cradles their growing body with care and safety. The Baby Zzz 5" Foam Mattress is water resistant and stain-resistant with a machine-washable outer cover that's easy to remove. This breathable foam mattress is safety conscious with a JPMA certification and added the design element of a hidden zipper.