The Edge MonoSki is a mono ski and sit ski designed for use by individuals with lower extremity or mobility disabilities or spinal cord injury. The ski comes with a carbon fiber seat, a suspension system with a steel spring, a nylon web waist restraint, and a nylon web foot restraint. The user can select a small (13.5 inches), medium (14.5 inches) or a large (15.5 inches) bucket seat and ride height is adjustable.The following spring rates are available (weight necessary to move the spring 1 inch): 225, 250, 275, 300, 325, 350, 400, 500, 550, and 600. OPTIONS: A titanium spring (add $250.00) is available. SIZES: 6.5-inch travel or 8-inch travel. DIMENSIONS: Height is 11 to 13 inches (6.5-inch travel) or 13 to 15 inches (8-inch travel) above the ski. SEAT: Seat width is 13.5 inches (small), 14.5 inches (medium) or 15.5 inches (large). CAPACITY: 225 pounds. WEIGHT: 28 to 32 pounds. WARRANTY: This product is warranted for one year from the date of purchase against defects in material and workmanship only.