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The X-Stream Fin from Mares is a performance, comfortable and lightweight design and are the incredible result of sixty passionate years at the service of diving. The X-Stream is truly a leap into the future, and changes forever how we envision the creation of a fin. More than 2 years of resources, experiments and testing and four Mares patents all concentrated in one unique product. The Optimized Pivoting Blade system (OPB) allows the blade to maintain an optimal angle throughout the kicking cycle, whereas traditional fins achieve this only during a small portion of the cycle, OPB produces a constant thrust, which minimizes fatigue and produces fluid movement through the water.