The Giro Athlon was created in response to their efforts to better the hugely popular E2 Helmet. In Giro's world this is true -- make it better or don't waste the effort. Well, they didn't waste their time. The Athlon betters its predecessor by moving air more efficiently over the rider's head, and its shape has been improved by Giro's attention to form language.You shouldn't be surprised. Giro would never release a new helmet that didn't outperform the one that came before it. Even though the vents in the Athlon appear smaller than what you remember on the E2, Giro has improved their internal channeling to move that air over your head faster and easier. There are a total of 23 wind-tunnel-tuned vents for both intake and exhaust. The Athlon's shape is more in tune with a human head than the E2. This is actually something we'd struggled with when checking out the E2. We liked the vents, the Roc Loc, etc, but the helmet didn't work with our aesthetic sense. It turns out that Giro felt this way too. So the shape is more organic but still has an aggressive quality about it. The Athlon also sits a bit lower on the head which helps it seem to disappear when riding. The Athlon uses Giro's latest retention system, Roc Loc 5. The advantage over the older Roc Loc 4 is that you can make micro adjustments to the retention basket with a thumb and finger -- simply twist the ratcheting dial to achieve perfection. The whole system can be adjusted up and down to cradle the back of your head just as you like. Some of Giro's forward thinking gave rise to the special shape of the arms -- they allow the use of Giro's eyewear without interference, and they maintain the position of your straps so getting the helmet on is a no-muss, no-fuss affair. The Giro Athlon Helmet is available in Black/charcoal and Matte White and in three sizes -- small, medium, and large. The visor has 15 of vertical adjustability for optimal protection/visibility, and it's removable as well. The wicking pad...