Shimano RC903 S-Phyre Road Cycling Shoes The Shimano RC903 S-Phyre Road Cycling Shoes deliver WorldTour level performance, are lighter than their predecessor and offer an improved fit. The upper uses a microfibre synthetic leather that's flexible to reduce the risk of hotspots developing and includes micro-perforations to improve ventilation. Another feature that keeps the feet cool on hot summer days is the lower portion of the tongue using a perforated mesh. Two BOA dials secure each shoe and allow quick and easy mid-ride micro-adjustment. The carbon fibre sole is incredibly stiff and the midsole is seamless, meaning stack height is reduced, so power transfer is excellent. An anti-twist feature to the heel cup holds the heel in place, even when putting in a hard effort. VIMEO:764055238:560:315