The side of these are a little tighter than norm. the shape is more oval so give yourself some leeway. If you measure on the far end of the size spectrum, go up a size if you got a round skull. Other than that, very comfy, VERY light helmet. makes you forget you are wearing one.
These helmets by POC are always sold out for a reason. They are the BEST! These are way more comfortable than TLD in my opinion, and they look really cool and are of high quality. You get what you pay for, trust me! Has deep coverage at the back of the head and sits low on the head. Worth every cent!