Scarpa SPIN INFINITY is the trail running shoe dedicated to long distance and is one of the most cushioned offerings to date. Designed for long distance trail training and ultra racing, the Spin Infinity has a dual-density EVA midsole, featuring a low density base that provides plentiful cushioning and impact absorption, on top of that is Scarpa's Foot Stabilizer Control system (FSC). The FSC system is a firmer EVA layer that encircles the perimeter of the midsole and also spans the arch area, providing lightweight stability and torsion control. The midsoles 4 mm drop encourages an efficient stride, further enhancing its long distance capabilities. Secure ground contact is assured by the Vibram outsole, combining 4 mm lugs and Megagrip rubber to optimize traction and grip. The mesh and welded PU upper with Sock-Fit construction is light and breathable but still provides foot-wrapping support and a secure fit. This combination of upper and outsole package results in the perfect blend of weight savings, cushioning, support and traction. All of these elements come together seamlessly in this high-mileage trail