Its internal mps adjustment system allows for an optimal fit providing extra comfort to your ride be that during the race of truth the time trial or pushing the pace during the bike leg of a triathlon catlike have tested the chrono helmet extensively in wind tunnels and on the road along with top engineers and world class racers who have worked closely with catlike to develop the ultimate aero helmet venting the chrono helmet has only a single ventilation port at the front of the helmet m