Overall, a nice helmet. I feel that it runs quite large though, making your dome piece look pretty big. From the sizing chart, I was on the small end of the "Large" size, which is what I purchased. In hindsight, I should have purchased the medium helmet as the internal adjustement will allow you to open it up. I later tried on a medium in a store and was able to get my head in their comfortably. My only real complaint is the clip for the chin strap. On most helmets, the clip is offset to allow for a chin pad. On this helmet, the clip falls directly under the chin, which does not allow for any padding and can cause some minor doscomfort. I eventually got used to it, but I think that Giro should consider this in future designs.