While many of us have inflated heads about our respective prowess on a bicycle, some amongst simply have king-sized noggins as a matter of physical reality. If you count yourself among the big head-set then the Giro Bishop XL Helmet is just what you need. The full coverage shell is both strong and lightweight while the 22 vents serve up a massive amount of ventilation. A snap-fit visor offers relief for your eyes in bright sunshine and easily detaches when it’s not required. And what’s not to love about the ability to get a perfect fit with a single hand via the Acu Dial. In-Mold construction allows helmet to be lighter, more durable and better ventilated than traditional designs EPS liner and polycarbonate shell add reinforcement in crucial areas Acu Dial retention system ensures single-handed adjustment 22 vents provide superb cooling and airflow Removable snap-fit visor protects eyes from sun, rain and debris Rear reflective decal increases visibility in low-light conditions