Dan Be wrote an answer about Catlike Leaf Helmet on July 5, 2014
Not quite sure what influenced the decision to only make this in two sizes. If you are at the bottom end of the sizing scale for the medium but are within the sizes listed the helmet will adjust to your head and will fit. If you are right below the sizing that is listed then the helmet likely will be too large. Feel free to contact our gearheads via live chat or by calling 1-800-409-4502 for further help sizing this helmet.