The SH XC51 Mountain Bike Shoes are built for XC racing performance and borrow heavily from Shimano's top shelf offerings to deliver you the latest technology at an entry level price. Shimano's Dynalast technology delivers you the most precise and comfortable fit with the most effective power transmission. The XC51 features a glass reinforced polyamide sole that offers you the perfect combination of stiffness and flexibility, which translates into more efficient pedaling and a versatile, springy platform that's ideal for run up sections. In addition, the polyurethane lugs and the optional toe spikes provide excellent traction in the sloppiest of conditions. Shimano uses a durable, stretch resistant synthetic leather for the XC51's uppers and incorporates mesh panels for improved ventilation. The XC51 also has an armored toe for added protection and longevity. Shimano's insole comfortably stabilizes your heel, and one ratcheting buckle and two hook and loop straps let you dial in the perfect fit.