ZIPPERED * Twin 39 x 75 x 9 * Excellent retail packaging! * Protects mattress * Heavy 3 gauge plastic * Individually sealed in a poly-bag * Treated with flame retardant * Fits both mattresses and boxsprings up to 9 thick * Notice to California Consumers: WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm *