Shimano RC7 Men's Wide Cycling Shoes Deliver Quality ready to race those of us who needs shoes with more volume? Copying the standard width version These sneakers have a carbon composite sole and a comfortable upper providing a balance between high effort intensity and comfort over long distances and all this at an attractive price. Shimano makes the RC7 from perforated synthetic leather , chosen for its lightness, comfort and because of the ability to pass cooling air throughout the shoe. Each shoe is secured with two micro-adjustable Boa L6 discs on top and wide mounting points distribute pressure evenly across the top. Underfoot, the rigid carbon fiber composite outsole ensures efficient power transfer and has a high flex rating of 10 on Shimano's 12-point scale. what does it mean that we won't have to worry about loss of power or tiring sole flex.