DESC: Giro 2012 Athlon MTB Helmet - Metallic Orange/Black - Medium The Giro Athlon was developed with a single purpose in mindXC racing. This helmet combines 23 generous Wind Tunnel vents plus smooth style, a compact shape, minimal weight, and an updated, low profile P.O.V. visor. Youre not going to find a better performing, more comfortable, competition-specific MTB helmet.