The HJC RPHA 11 motorcycle helmet is a finely tuned, premium quality, full-face motorcycle helmet for sports and track-day enthusiasts. It has HJC's Plus Integrated Matrix (PIM) shell construction of carbon fibre, aramid and carbon-glass hybrid fibres to produce a solid superlight helmet. Designed in HJC's wind tunnel, the shell shape maximises its aerodynamic potential with rear and side spoilers to ensure stability at any speed. The detachable chin curtain reduces wind noise and blocks out turbulent airflow. The RPHA 11 has an advanced channel for the liner, which allows cool air and pushes hot, humid air out of the rear. The chin bar and new forehead vents have a simple slider mechanism, whilst each of the top vents has a glove-friendly rubberised dial allowing you precise control of the airflow. The helmet's MultiCool anti-bacterial lining wicks moisture away for even more comfort and is removeable and washable. For the spectacle wearer, the helmet even has a 'glasses groove'. The visor has an enlarged aperture for increased vision, with an enhanced central one-touch locking system enabling the visor to be locked closed for high-speed track days. The helmet is supplied with a Pinlock anti-fog lens and clear and smoked visors.