Synchwire construction is a stitch-less upper that's vented and reinforced to create a lightweight cycling shoe with incredible airflow and structural integrity. Synchwire is an advanced composite of thermo-bonded film that provides overall durability, a non-woven internal sheet for distributing the force from the closure system to the upper for direct power transfer, and mono-filament mesh for ventilation. The BOA® L6 Fit System provides fast micro-adjustability with the turn of the dial. The combination of the dial, lace, and guides reduces weight and provides finer adjusment (1mm increments) compared to traditional buckles, and it offers an instant release function too. The BOA Fit System dials and laces are guaranteed for the lifetime of the product. Our injection-molded nylon and glass fiber outsole is stiff and light, and features over-molded heel and toe pads for durability. The universal 3/2 cleat bolt pattern allows you to choose 2-bolt- or 3-bolt-style cleat/pedal systems for versatility and personal preference. Reflective details enhance visibility at nighttime or in low-light conditions when illuminated by a light source, such as headlights, by returning the light back to the source and reaching the driver's eye.