This is a demonstration store. You can purchase products like this from Pure Fix Cycles

The Atmos is one cool helmet.  How cool you ask?  It's got so many vents you'll worry John McClane is crawlin' around in there hunting baddies.  He's not though, it's just the wind cooling your dome, making this the perfect helmet if you Ride Hard.

• Features In-Mold Composite reinforcement
• Increased ventilation
• Includes Roc Loc 5 comfort system
• Perfect for road, XC, cyclocross, and general mashing

See Giro's Fit Guides: Sizing Chart | Measuring Guide.