The premium 100% Aircraft Composite downhill MTB helmet is precision engineered with a fiberglass composite shell that provides a very strong yet lightweight design. * helmet meets standards: ASTM (F1952-10), ASTM F2032-06, CPSC 1203, EN 1078:2012+A1:2012, AS/NZ 2063:2008 * fiberglass shell construction * active cooling system - 25 vents ensure high flow * washable anti-microbial liner, cheek pads and chinstrap covers * Multi-Density EPS foam injected with polycarbonate * steel D-Ring buckle - provides a secure fit * adjustable visor with lightweight aluminum screw * adjustable visor * light weight * designed in 2 shell sizes and in 3 EPS sizes * compatible with most neck collars * size M (57-58cm) * enduro helmet 100% * full face helmet 100% * integral helmet 100% * cycling helmet 100% * branded helmet 100% * downhill helmet 100% * MTB helmet 100%