Dream On Me 40R, 4” Thick Round Crib Mattress is unique in its circular shape, measuring 42 inches 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-inch fiber core is enclosed in a fully washable, fire retardant. 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.