The Dream on Me Circular Crib Mattress is unique in its circular shape, measuring 42" in diameter and firmly supports your baby for a restful sleep. This mattress is proudly Made in the USA and constructed with quality materials featuring a cloth boarding binding. The 4" foam core is enclosed in a fully washable, fire retardant, antibacterial, hypoallergenic, triple laminated cover that aids in the prevention of mold, mildew and odor. Rest assured this mattress is phthalates and lead free and fits The Dream on Me Posh Sophia, circular crib and most standard round cribs. Wipes clean with warm soapy water. This exceptional Mattress meets the Federal Flammability Standard 16CFR 1632.