Strap on the Shimano MenAAAs SH-R310 Cycling Shoe and stop losing all your hard-earned pedal power to flex. The R310AAAs stiff carbon fiber outsole maximizes energy transfer from foot to pedal. Heat-moldable technology provides a dialed-in fit while an anatomical last increases comfort on those long rides. This Shimano shoeAAAs vented upper and honey comb mesh help keep your feet cool even when the competition heats up.