Raised van top is necessary for tall driver in wheelchair to maneuver inside van and to have proper visibility for driving. Variety of sizes for different vans but not all sizes available for all vans. Roof is white fiberglass. Sport Top offers 5 feet of headroom; full size offer 6 feet of headroom; mid size give 5 feet 4 inches. Sport Top has 2 windows and luggage rails. Raised windows available separately.