The Fox Striker looks great and provides great protection. This makes a trail helmet given its deep rear profile, and the removable visor will keep the sun’s rays from blinding you. 22 channeled vents provide excellent airflow. This is accomplished by taking air in the front and bringing it up and around your head. Finally the cool air flushes warm air out of the rear of the helmet. This Ventilation system keeps you cooler for longer. The Striker also carries 3 certifications, keeping you protected and safe.Sizing: measure around the head above the eyebrows.