Fox Head Flight Sport Trail Bike Helmet SIZING - Available in sizes Small (20 - 21 in), Medium (21 - 23 in), and Large (23 - 24 in) SAFETY - Specially designed with the dirt jump aficionado in mind, The Flight Sport pairs a single density EPS core with a durable ABS exterior to give you the protection you need without weighing you down. STAY COOL - The Flight Sport Hardshell features 8 Big Bore vents, increasing airflow while you ride to keep you cool. STAY COMFORTABLE - The heat sealed comfort liner gives off a clean look and feels great when the helmet is on. USE - Fox developed the Flight Sport with dirt jumpers in mind, but it can be used for so much more. Wear it everywhere- during leisurely park rides, long days dirt jumping, or even on hard, adrenaline filled trail rides; this helmet can stand up to whatever you throw at it. Life is short, go wild!