X-Stream comfort, X-ceptional efficiency, 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. 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. The limiting factors in traditional open heel foot pockets are their weight and the parachute effect”. When finning, water gets into the space between the bootie and the foot pocket, creating drag like the air in a parachute. The perforations prevent this and have the additional benefit of making the foot pocket very soft and flexible. Furthermore, the suction effect which can make doffing of the fins cumbersome, is now forever a thing of the past. The Mares bungee fin straps where created as a smart alternative to the steel spring straps, this unique fin strap relegates adjusting a fin strap to a thing of the past. Bungees exceed steel springs in all aspects: Higher elastic properties, unaffected by sun, salt and chemical agents, lower weight and lower cost, and Mares has 40 years of experience using bungees as a key element in spear guns. With the new Mares bungee strap donning and doffing a fin is a breeze and the comfort during the dive is guaranteed by the new ergonomic heel cover. The heel cover comes equipped with a large hand loop allowing easy pull-to-stretch the bungee strap effortlessly over the heel of your foot. The Super-Channel is designed for the diver who wants the perfect blend of power and efficiency in one fin. The new blade design with a large central super-channel and two traditional lateral channels provide excellent thrust while maintaining hi-efficiency and minimizing leg fatigue. The blade uses tri-material construction, constructed of techno-polymers and thermoplastic rubber for extended durability. Mares design inspired by marine mammals. Channel thrust technology maximizes the channeling of water and moves a much greater amount of water compared to other fins of the same size. The result is greater thrusting power with the same amount of effort. The adjustable fin straps are equipped with large heel pull tabs for easy donning and doffing. Fins overall lengths are 23″ to 25.2″ (60cm to 64cm) depending on size and weights 3.3 lbs. (1.5 kg) in size regular. Fins are available in multiple sizes and colors. Regular size has a blade surface area of 116.3 cubic inches (750 cubic centimeters).