The dual lift system included with the Smartop Swim Spa cover makes easy work of opening and closing the covers required for larger spas. This swim spa cover is available as an Upright, Vanish XL or Hybrid model (one Upright, one Vanish XL as shown). Available for spas measuring 121 inches to 240 inches. The Upright model requires a minimum of 8 inches of clearance behind the spa and 3 inches on each side. The Vanish XL swim spa cover requires a minimum of 28 inches of clearance behind the spa and 5 inches on each side.