The helmets of the 2014 Generation 3 and therefore have a part number that starts with NTG3 -..... (instead NTG2 and NTG1). The main difference is the new distinction of the variables in S, M and L, while there was previously for S and M only a common size. Therefore the Kompfunmfang should be accurately measured and ordered accordingly.
Pay on delivery that you actually then get the size S or M and not S / M. This would be an indication that you have received an old helmet of generation 1 or 2.