Soft, knit fabric cover * 4 Inch, 9 ILD memory foam * Memoir mattress also available in 6 and 8 Inch * Allow 48 hours for the memory bedding to expand to its proper size and shape * Meets federal flammability standard 16 CFR 1633 * Available in 6, 8 and 12-inch thick * ILD 9, 4-pound memory foam for ideal firmness * Relieves pressure points on your hips and shoulders while you rest