Easy to pop up and close down for outdoor activities ; High quality, rust resistant steel framework * Blocks up to 90% of the sun´s UV rays * Walls attach with Velcro fasteners for easily assembly/removal * (2) 10" wide removable sidewalls with large 4 pane windows; (2) 10" wide solid end walls with Velcro attachments * 232" long x 116 1/2" wide (distance between legs - 114" wide); Lowest point on sidewall frame (at lowest height setting): 64"