the hi-tec hts74 fizo was developed in 2013 where the product team merged two of hi-tec best developments throughout the years; the infinity trail (knitted upper technique) and the rolling gait system. both technologies proved their value to athletes around the world who liked to venture from path to trail. ___ technology suze: seamless upper zone engineering for breathability, full support and comfort. Welded pu cage for durability and fit. the vibram rollin gait system sole unit has an innovative midsole and outsole combination that supports the natural movement of the foot to reduce muscle fatigue.