The Shimano S-Phyre RC903 Shoe has added ventilation, created a more comfortable fit, and reduced weight from the previous 902 S-Phyre shoe. The Shimano ultra-stiff carbon sole translates to efficient power transfer, (12 on Shimano&';s Stiffness Index). Lacing from the Dual micro-adjustable BOA Li2 dials has been adjusted to further prevent hotspots, and the redesigned anti-twist heel cup keeps your feet locked in. Importantly, Shimano has replaced the previous, rigid "Power Zone" cable guides for a simpler cross-lacing pattern. They found that a majority of riders were crossing their Boa dials for a closer fit anyways, but the plastic pieces caused pressure points with some riders. Shimano quotes a pair of size 42 shoes as weighing 450 grams, a 20 g saving from the RC902. While this is slightly lighter, the big changes are done in the name of comfort. Ventilation in toe and heel Anti-twist heel cup Microadjustable BOA Li2 dials Shimano Stiffness Index: 12 Carbon Sole The Shimano S-Phyre road shoe is a high-performing road shoe that breaks the limits of all previous 902 models. Wide sizes are available, as are women&';s specific sizing options too. In stock here at Contender Bicycles.