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The result is an asymmetrical shape, with the throat of the shoe curving over the foot from its outside to its inner side.\u003c\/p\u003e\u003cp\u003eThe new, moderately stiff, R4 outsole strikes a balance between comfort and pedalling efficiency to make it a true all-rounder. R4 has a new, even lower profile, and is structurally optimized with a composition that includes 15% infused carbon fiber. The R4 outsole provides efficient ventilation and internal channelling for temperature management. The cleat positioning is slightly further rear-wards compared to traditional settings, to optimize pedalling efficiency and reduce knee compression, especially well suited to very aggressive,   forward aero positions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFEATURES\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eOvercurve: asymmetrical construction that ergonomically conforms to the footâ€™s anatomy\u003c\/li\u003e\n\u003cli\u003ePU laminated mesh upper: enhanced ventilation with support where needed\u003c\/li\u003e\n\u003cli\u003eR4 carbon injected outsole: moderately stiff for efficient power transfer in comfort\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSPECIFICATIONS\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePU laminate over mesh upper  \u003c\/li\u003e\n\u003cli\u003eSingle BOA\u003c\/li\u003e\n\u003cli\u003eR4 outsole â€“ carbon injected nylon, stiffness index 7\u003c\/li\u003e\n\u003cli\u003eWeight: 221g (size 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