This demonstration video discusses and shows the features of the Mares X-Stream Adjustable Strap Fins. The X-Stream Fins feature an OPB system for great efficiency which allows the blade to maintain an optimal angle throughout the kicking cycle, whereas traditional fins achieve this only during a small portion of the kicking cycle. OPB produces a constant thrust, which minimizes fatigue and produces fluid movement through the water. The Channel Thrust Technology maximizes the channeling of water and moves a much greater amount of water compared to the other fins of the same size. The result is greater thrusting power with the same amount of effort.