The mares x-streambine mares patented technology to offer a riddled foot pocketfort, super-channel blade design, and adjustable binding buckle system for a unique fin that is as powerful as itfortable. More than 2 years of resources, experiments, testing and four mares patents all contributed to the creation of this unique open heel scuba fin. The optimized pivoting blade system (opb) allows the blade to maintain an optimal angle throughout the kicking cycle. Opb produces a constant thrust, which minimizes fatigue and produces fluid movement through the water while diving. The ergonomically designed foot pocket delivers maximum power and evenly distributes pressure over the foot to minimize fatigue. The foot pocket interior features internal ribbing that improves fit, eliminates foot suction and prevents foot pocket flexing while transmitting more power to the blade. Perforations in the foot pocket allow water to move freely in the space between the foot pocket and the booty, eliminating any drag caused by the parachuting effect. The mares x-stream uses mares patented design abs plus buckles (adjustable binding system). It only takes one quick movement to easily open or close these buckles, even when wearing thick neoprene gloves. The double button release prevents the buckles from accidentally opening. The super-channel is designed for the diver who wants the perfect blend of power and efficiency in one fin. The new blade design has a large central super-channel and two traditional lateral channels that provide excellent thrust while maintaining hi-efficiency and minimizing leg fatigue. The blade uses tri-material construction of techno-polymers and thermoplastic rubber for extended durability.