With so many helmets to choose from, how do you know what you are really getting The Giro Trinity Helmet is a simply engineered design to keep your head protected and cool. The Trinity was constructed using Giro's In Mold technology. This process fuses the shell with the EPS foam body to provide structural integrity. In addition, it also means that it is better capable of absorbing impact, should you happen to hit the pavement. The helmet itself features 22 large vents that help to move air over your head to evaporate sweat and keep you cool. And because a helmet does you absolutely no good if it doesn't stay on your head, Giro uses its Acu Dial fit system to secure it. Reflective accents have been added to the rear to make you more visible in low light conditions.