Named after the number of vents, the Project.21 combines massive airflow with the coverage demanded by increasingly technical bike park, all-mountain and enduro trails. This airflow gives a cooling effect to keep you comfortable whilst concentrating on the trail ahead. Like itsProsibling, the Project.21 uses Energy Reduction Technology (ERT). This patented 4mm layer of lightweight polymer material dissipates both linear and rotational impact energy. Unlike other systems, ERTresponds instantly even at low-impact levels commonly seen in riding.The Project.21 also uses our CRV (Crash Release Visor) system to make sure rotational forces are reduced on impact.Thats a lot of protection technologies in one helmet as we wanted it to be the best open-face helmet in our range and to inspire rider confidence when worn out on the trails.The Project.21 Trail comes with two pad kits to customise your fit. The 7iDP Rear Dial Adjuster allows incremental tuning on the fly, even with thick wint