I have never been one to like a full-face helmet, I could never fine one that was comfortable. My head is at the top of the L, bottom of the XL, I also had problems with my upper ears folding down when putting it on and on most no matter how I tried couldn't get them to straighten out ( very uncomfortable). I do own one though, but I only wear it on very cold days, 40 or below. Recently at the Thunder Beach Rally, I tried on a Nolan N103 full face witht the swing up chin bar. I first tried the L, way to tight, very uncomfortable. Then tried the XL, perfect fit, the most comfortable helmet I have ever worn, the ear pockets are very generous.
Needless to say I bought one. Of all the dozens of Full-face helmets I have tried in the last 40 years or so, I know I tried one in the early 70's, I finally found one that fit and was comfortable enough to wear. The other good part, this is a $400 helmet, I checked a few dealers after I got home. This dealers regular price was $300, and he had 4 colors that were being discontinued that was $240, one of these was a bright red. being my Spyder and my BH trike are bright red, and my BH bike and Rune are a darker red, seemed perfect.