Designed to protect your brain from rotational the most common impacts, the lightweight Aerocore construction of this helmet provides an increased level of protection at a minimal weight. The adjustable vents allow use throughout the seasons, and the sweat wicking X Static lining keeps you dry and prevents odor. . . . MIPS polycarbonate shell. EPS impact foam. Aerocore construction with Koroyd. AirEvac 2 ventilation with Regulator adjustable vents. X Static moisture wicking and anti odor lining. Adjustable Dial Fit System DFS2. Snapfit SL2 ear pads.