ARAI IS THE ONLY COMPANY OFFERING MULTIPLE INTERIOR-FIT SHAPES TO BETTER ADDRESS THE INFINITE VARIETY OF RIDERS HEAD SHAPES AND SIZES.No one pays more attention to the subtle variations and infinite possibilities of the human head shape than Arai. Why? Because its the secret to getting the best comfort and fit.And Arai is nothing short of obsessed with putting you into the best fitting, most comfortable helmet possible ? because that?s who we are.The Signet-X has Arai's LONG OVAL (LO) interior fit shape. Longer front-to-back and a more narrow side-to-side (as compared to Intermediate Oval).**A Helmet needs to be tried on in order to determine a proper fit.