20+ Helmet Size Chart Smk Background. Smk size chart smk twister zest gl135 pinlock fitted with clear visor gloss mens helmet red blue large. Not sure about the size of your new helmet?
It has to fit right and tight to keep you safe.
Has been providing riders with quality helmets at affordable prices since 1969. Selecting the right helmet size is one of the most crucial part of buying a helmet. Not sure about the size of your new helmet? Never buy a used helmet or borrow someone else's helmet.