Black Polyurethane Adjustable-Height Rolling Stool with Memory Foam Seat - NBF Signature Series Easy Collection BUILT FOR COMFORT: With the 15"D memory foam seat, this chair ensures lasting comfort for all - 250 lb weight capacity EASY TO CLEAN UPHOLSTERY: The memory foam seat is covered in black polyurethane upholstery making it easy ADJUSTABLE SEAT HEIGHT: The height of this stool is easily adjusted from 16" to 21" with just a pull of a lever POLYURETHANE CARPET CASTERS: This stool features polyurethane carpet casters making it easily moveable across all office floors DIMENSIONS: 16-21"H x 24"DIA