S/M comfort liner is for the medium shell sizes.
This bridge the gap from the XS/S helmet shell to the M/L helmet shell. But they only fit the M/L shells. So it tightens the fit on the Medium for someone that the Small is too tight, and the Medium is too loose.

6D ATR-1 Camo Helmet, XL
Arai White
Arai Black
Arai MX-V Stars & Stripes Motocross hjelm




