The SHXC90 Shoes are Shimano's purposedesigned, crosscountry race shoe. They're fully heatmoldable, which ensures a precise fit, and the Rovenica synthetic leather uppers do a good job of conforming to your foot without stretching out, so you get the same fit over the life of the shoes. The sole is Shimano's carbon fiber XC sole, and is optimized for both fit and power transfer, because if the shoe doesn't fit, putting out watts is the least of your concerns. The shoes are finished off with polyurethane lugs, which is what really separates these shoes from Shimano's highend road shoes. Sometimes you have to walk/hike/run with your bike, and these slightlysofter lugs keep you from sliding all over the place while you try.