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Question answered Over 5 months ago
Answer: The Arai size medium is intended to fit a head circumference of 22 1/2" to 22 7/8" (57 - 58 cm). The size large is is intended to fit a head circumference of 23 1/4" - 23 5/8" (59 - 60 cm). Our best suggestions is that you measure your head with a metric tape measure to see if you are closer to 58 of 59cm.
All of our clothing, footwear, helmets and protective-gear qualify for our Free First Exchange program. If you need to exchange a brand new and unused item for another size or a similar product, we will cover all of the shipping expenses for both the return and the replacement.
When a new helmet is first worn, it should actually be slightly tight, with the interior coming into contact with most of the head, but not so restrictive that it causes any pain. There should be no "hot spots" - places where the helmet's interior puts pressure on specific points of the skull or face - but it should not move around freely. With time, a helmet adjusts to match the shape of the rider's head as it is worn, "breaks-in" and loosens a little. However, it should never become loose enough to easily turn from side to side. Please read our fitting guide at this link: https://www.motosport.com/blog/motorcycle-helmet-size-guide-how-to-measure-fit-the-right-helmet