Giro Atmos Road Bicycle Helmet Closeout. Comfort, performance, and protection define great helmets and the Giro Atmos Road Bicycle Helmet has it all. This was the first Bicycle Helmet to feature In Mold Composite reinforcement that gave all the protection but with way more vents count 'em, 26 on this one so you've definitely crossed into Birth of the Cool territory here. Add in a Roc Loc 5 retention system and you'll revel in the perfectly comfortable and secure fit that's become a given from Giro. So whether you're a road, tri, or 'cross rider, or you want a great touringcommuting Bicycle Helmet, check the Atmos.