The Mountain
Active Member
I just replaced my 4 year old Shoei RF1200 with an XD-4, which should arrive today. I was right on the line between a Med and a Large, so I bought the large. I see that Arai sells different thicknesses of liner, and the Med comes with a 10mm and the Large with a 7mm, and both appear to have the same shell. Does anyone know if the size difference for the two is down to just the thickness of the liner it comes with? Where I'm going with this is, if the Large turns out to be too loose with the 7mm liner, and I buy the 10mm liner, did I convert to a Med, or is the EPS thickness also different? Additionally, if the thicker liner is not the only difference, how can I tell what thickness of liner to buy? There is also a 12mm liner available, so I can go with either a 10 or 12 to change the fit.