I did a lot of research before I purchased this helmet and I think it paid off. First of all size and shape do matter when choosing a helmet. Be advised that this helmet will fit a person with an intermediate oval to long oval head. My head measures exactly 23 inches and have an intermediate oval head shape. The size chart shows that a medium would be too small and a large would be to big. I am an in between size. This is where head shape becomes a factor. Since I am an intermediate oval, I chose the large since this an intermediate to long oval helmet. That means that the helmet will be a bit narrower as measured vertically. The large fit me perfectly. Had it been designed strictly for a long oval, it may have been too small and if it were designed for a rounder head, it may have been too big. It is a very comfortable helmet with very good air flow even though it only has one front vent. Supposedly, the HJC C70 is supposed to be highly rated by DOT, European and British SHARP standards. However, I have read on some sites that the helmets sold in the US are different than the helmets sold overseas. Please do your own research though. Even if this is true, this helmet has proven itself over and over as being a life saver. There are many testimonies that back this up. The only drawbacks I have found is with the sun visor. It does not lower completely. There is a bit of a gap at the bottom. This is really not an issue with me but it might bother some. Also, when the sun visor is lowered, it does restrict the air flow a bit. Again, this does not bother me since I live in a cooler region. There is also a bit of chatter out there that this is a discontinued helmet and it might be hard to find replacement parts in the near future. Again, please do your own research. Regardless of the imperfections, this is a very solid, well built and comfortable helmet and I am glad I own one.
