A durable 18 oz vinyl-coated nylon cover and high-density foam soften impact so hurdlers of any skill level an focus on improving their form rather than worrying about injury. The design is great for indoor practices because it will not damage floors. Its double hook -and-loop fasteners ensure height adjusters are held in place when in use. This system adjusts from 30" to 39"H in 3" increments to accommodate individual athletes. Truck delivery.