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The Shimano RC903PWR S-PHYRE Wide Cycling Shoe provides the same high-quality performance as the standard model but with extra room to keep us even more comfortable. The lightweight microfiber synthetic leather and mesh upper keep things breathable, while the carbon fiber composite midsole enhances stability and power transfer efficiency. For a personalized fit, Shimano included several types of closure to ensure each part of our foot feels secure and ready to put down max power, including a BOA Li2 metal dial, hook-and-loop toe strap, and Powerzone lace guide.