Flagship Racing shoe EvolvedWear Shimano's new Shimano S-Phyre RC903 Road Shoes and be confident.The Lightweight and breathable microfiber leather upper providesoptimal fit and superior comfort when you are striving to perform at your best.Power TransmissionShimano's S-PHYRE range has one goal: to maximize power transmission by delivering more performance per gram. Power transmission is a huge priority with the new S-PHYRE road competition shoe. With that in mind you can be certain that their SH-RC903 S-Phyre Road Shoes embody everything about Shimano's passion to create the best cycling footwear on the planet and to ultimately deliver the results you want and ignite your performance.Accelerating PerformanceThe external curved heel cup suppresses foot twist and roll and is essential to Anti-Twist Stabilisation. The shoes are built to handle the intense twisting forces caused by explosive acceleration. Foot movement studies and pedalling visualizations and athlete feedback have been used to redesign the shoe's structure to support more aggressive acceleration.Comfort is EssentialThe makers of Shimano's S-Phyre RC903 Road Shoes know that comfort is an essential element to power output, not an afterthought. How a shoe fits and feels defines its performance. Super light. Incredibly fast. Close to the action. The SH-RC903 shoes features a sleek, low profile crossover lacing pattern to gracefully secure the foot as well as the surrounded wrapping upper creates a totally engineered fit for all riders. Shimano have perfected Silvadur silver ion technology to ensure you stay fresh as a daisy all day long.Boa IP2 Micro-Adjustment DialsThe unified sole and upper construction set a new level of fit, pedalling stability, rigidity and weight reduction while the dual independent Boa IP2 dials allow quick and precise micro-adjustment even on-the-go.Shimano S-Phyre SH-RC903 Road ShoesTechnology: Silvadur silver ion technology helps prevent odour and stainingClosure: 2 BOA (Li2), BOA PowerZone Guide: allows quick and precise micro-adjustments and securityUpper Material: Microfiber Synthetic Leather 360 surround wrapping creates a supremely engineered fitOutsole Material: TPUMidsole Material: carbon fibre compositeStandard Insole: high density cup insole with adaptable arch padsAnti-Twist Stabilization: secures optimal foot positioning for intense acceleration and high tempo cadencesFunction-Specific Zones: scientifically optimized upper materials maximize fit and pedalling performanceIntegrated Seamless Midsole and Upper Construction: set a new level of fit, stability and performanceTechnologiesStiffness Rating: 12Upper: Microfiber Synthetic LeatherExternal Heel CupCarbon Sole/ Mid Sole: carbon fibre compositeHollow-Channel: Lightweight, ultra-rigid hollow outsoleExpanded Cleat Adjustment Range