Where classic styling meets everlasting value, the Aspect brings the proven fit & function of Smith helmets to an audience who will never again call this piece of gear just a helmet. Helmet Features Lightweight in-mold construction Airevac 2 ventilation New adjustable dial fit system (dfs 2) Regulator adjustable climate control 14 vents Snapfit sl ear pads Removable goggle lock Skullcandy® audio compatible (available separately) Helmet sizing: new dial fit system (dfs 2) + small 51-55 cm + medium 55-59 cm + large 59-63 cm + x-large 63-67 cm helmet sizing: new dial fit system (dfs 2) + small 51-55 cm + medium 55-59 cm + large 59-63 cm Certification: astm f 2040, ce en 1077:2007 class b Weight: 14 oz /400 grams