The Louis Garneau Chrono aero helmet has been improved from previous versions. The Louis Garneau Chrono aero helmet is one of the few time-trial helmets in the US that is CPSC certified, and it also complies with the speed skating ASTM F1849 standard. This aero helmet has been proven in the wind tunnels to give riders the extra edge for which they are looking and is well vented via seven vents. The Louis Garneau Chrono aero helmet is a great value aerodynamic helmet for time trials and triathlons
Features:
Size / Hat Size / Inches / CentimetersSmall / 6 1/2 - 7 / 20 1/2 - 22 / 52 - 56Medium / 7 - 7 3/8 / 22 - 23 1/4 / 56 - 59Large / 7 3/8 - 7 3/4 / 23 1/4 - 24 3/8 / 59 - 62