Mares X-Stream performance, comfort and lightweight design are the incredible result of sixty passionate years in 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. This positively buoyant fin utilizes the next generation OPB, while the new foot pocket eliminates the parachute effect, and the new blade construction offers less turbulence.