If you're curious about sleek, minimalist aesthetics and luxurious extras on the newest cycling shoes, then toss your tired, discolored old kicks whose age you can't remember and upgrade to Shimano's SH R321 Men's Cycling Shoe. Your feet will feel appreciated in the saddle with the R321's heat moldable uppers and insoles, and your legs will thank you on endurance days when the shoe's Dynalast fit earns you a claimed . 56% gain in efficiency on every turn of the pedals by orienting your foot in an ideal pedaling position. Slim and contoured, the R321 is Shimano's top of the line, pro level model, so it comes ready to work with Shimano's stiffest carbon composite outsole loyally transferring watts from your legs to the pedals with every turn of the crank arms. If you've ever pulled over and clipped out of your pedals to furiously loosen a buckle or strap on your shoe, you'll understand the value of the R321's ratcheting buckle closure. It allows you to micro adjust tightness as well as change the angle of the strap itself no more throbbing insteps and tingling toes. Around the top of your feet, Shimano wraps a Teijin synthetic leather upper that, together with Shimano's contoured Custom Fit heel cup, hugs your instep and holds your heels in place when you're mashing while allowing for plenty of airflow during a ride and refusing to stretch after hours or years of use.