The arch and upper instep sections inside the SH-R321 shoe incorporate a special thin-film, heat-moldable material that works to enhance comfort and maximize power transfer for pro racers. The arch-supporting heat-moldable material also promotes a more stable pedaling platform by preventing the rider's feet from shifting inside.
Customizable closure system adjusts to various instep height and shapes
Innovative “Surround” upper pattern provides perfect balance of holding power and absolute all-day comfort by wrapping the foot in a way that is securer and more comfortable than any previous designs.
This heel cup supports the entire heel from the outside and stabilizes pedaling by holding the heel snugly in place.
CFD analysis shows a 5.5% improved air flow patterns compared to previous generation R320