Cirque X with Level 4 ventilation. The ultimate ventilation control. A true helmet for all conditions. Level 4 venting combined with the ultimate evolution of ACT takes durability & protection to the pro level. ACT combines Polycarbonate plates and overlaps to create the lightest and strongest helmet available. A full wrap lower shell combined with MIPS, the rock solid quick release RCS fit system, Fidlock buckle and X Static fabric complete the package.