ERT System (Energy Reduction Technology) Patented 4mm layer of lightweight polymer material dissipates both linear and rotational impact energy 21 cooling vents Easy position visor angle CRV crash release visor System 7iDP rear dial adjuster with adjustable mounting points TF Through flow goggle ventilation Clip closure Meets CE, CPSC, AS Standards Sizes: XS/S, M/L, XL/XXL