Combining a traditional buckle closure full carbon sole & proven Body Geometry technology its easy to see why many of our sponsored riders choose the Pro road shoe. Lightweight FACT full carbon sole uses Torsion Box technology which increases stiffness for enhanced power transfer: 11.0 stiffness index Performance-enhancing BG features contours in the outsole & High Performance BG+ Footbed New D-link closure system is designed for lightweight secure ankle control & adjustability Low profile & lightweight M-lock SL buckle for secure closure Replaceable heel tread with internally recessed bolts for security Engineered Micromatrix upper is light durable & supple fitting Ultra-vented tongue for breathability 3-bolt cleat pattern fits Shimano SPD-SL Look Time & Speedplay Approximate weight: 280g (1/2 pair 42)