DownwindUNLEASH YOUR DOWNWIND POTENTIAL While many downwind specific SUP shapes on the market share similar designs, we have decided to take a different approach for our Downwind S TEC. We believe that the extreme beveled or fully rounded bottom and rail shapes create significant instability that causes discouragement for beginners. Therefore, we decided to go for a very flat bottom section where it matters the most: Right in the standing area. The stability