ARAI IS THE ONLY COMPANY OFFERING MULTIPLE INTERIOR-FIT SHAPES TO BETTER ADDRESS THE INFINITE VARIETY OF RIDERSï¾’ 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 itï¾’s 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 ï¾– because thatï¾´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.