The Syntax™ delivers sophisticated protection engineered for versatile riding. This helmet features extended coverage and a refined, streamlined silhouette that performs equally well on urban commutes and off-road adventures. Its European-inspired aesthetic combines form with function, incorporating Giro's In-Mold construction—a permanent fusion of polycarbonate shell and EPS foam liner that maximises structural integrity and airflow while maintaining a lightweight profile. The result is a helmet that balances comprehensive safety with minimal bulk, ideal for riders demanding both style and substance. HARDSHELL WITH IN-MOLD HARDBODY™ LOWER WRAP — The two-piece shell combines a tough outer hard shell with a polycarbonate lower shell permanently fused to the liner for durability without excess weight. WIND TUNNEL VENTILATION — Giro helmets are developed utilizing our proprietary Wind Tunnel™ ventilation system. This elaborate design combines active vents in the helmet's shell with exhaust channels inside the helmet that thrust fresh, cool air over and around the rider's head while forcing heat and stale air out. It's the most effective cooling system available, and a difference you can feel every time you ride. IONIC+® PADDING — Pure Silver is the secret ingredient that gives IONIC+® the power to provide natural, permanent odor protection to keep your helmet feeling fresh. Bike Helmet Size Guide How to measure your size – Wrap a measuring tape around your head, keeping the tape level from front to back. Note the measurement and reference the Size Guide. Note: Make sure the helmet fits with a little room when the fit system is loose, and sits low enough to protect your forehead without hindering your vision. Once you’ve got the right size, you can adjust the fit. Adult Size Circumference S 52 - 55.5 cm M 55.5 - 59 cm L 59 - 62.5 cm XL 62.5 - 65 cm
