Our Tower Premium Series uses “Double Layer” construction. Founded in 2010, for over a decade Tower produced only inflatable paddle boards using double layer, hand glued construction, which is the gold standard and most expensive base construction method in the inflatable stand up paddle board industry. The boards in our Tower Premium Series represent the tried and true inflatable paddle boards that we’ve sold for over a decade, and that have made Tower Paddle Boards a household brand name known for quality iSUPs.