Overcurve: asymmetrical construction that ergonomically conforms to the foot’s anatomy\nMicrotex upper: supple yet strong and durable for a comfortable and consistent fit\nR5 nylon composite outsole: delivers balance between comfort and pedalling efficiency\n\nMaterial: upper: Microtex, laser perforated\nsole: injected composite carbon vented\nSole standard: Three thread inserts, fitting all current road pedal systems\nSpeedplay (4 thread inserts) fits only with a special adapter\nWeight supplement: manufacturers specs (size 42.5)