Product Description. Dream On Me 3′ Foam mattress play yard. It’s constructed to create a comfortable environment to play and sleep. This exceptional mattress is manufactured with quality materials and workmanship, featuring a hypoallergenic, anti-bacterial waterproof cover that wipes clean with mild soap and water and aids in the prevention of mold, mildew and odor. Comfort & Convenience Dream On Me mattresses are manufactured for comfort. All our mattresses, whether spring-coil based or foam-based, are manufactured to provide supreme comfort and support for your baby’s growing bones. This is the second Dream on Me 3″ Foam Mattress I am buying. Due to limited space (and safety concerns as I find Pack-N-Plays safer than cribs) I use Pack-N-Plays exclusively as baby’s crib. .