Featuring custom low, snug fit, the Evolution helmet is one of the slimmest hard shell designs available. It features a tough skate style hard shell construction which securely protects all the useful bits of your head. The design curves anatomically around the head for a great fit and tailored wearing comfort. The injected colour line is manufactured with a less elaborated coloring process allowing us to offer it at a lower price range. ABS Hardshell. EPS impact Foam. Low fit, Snug fit, Tuned fit system. 14 aerodynamic vents, air flow channels. Heat sealed padding kit. S/M: 54-56cm. L/XL: 57-59cm.