Bought the 52-57 cm. I wear a 7-5/8" fitted hat size and this helmet just fits me when I expand it to the largest setting. The band that sits on your forehead seems like it will be less absorbent and more comfortable when I sweat. My prior helmet was a Petzl and the forehead band on that is super absorbent and ends up super soaked.
This review was written in the old system and had content requirements that are different than reviews written today.