Designed specifically for all existing Area 52 SI and Roswell 51 Towers, this bimini top provides exceptional sun protection. The collapsible design allows you to control shaded areas in your boat. When not in use the SI Bimini Top folds up into two bimini storage boots while still remaining on the tower, so it can be easily accessed when you need it. The top is made of popular Sunbrella material, and the frame is aluminum with upgraded stainless hardware. Storage boots included.