Sizes: S (6 5/8 – 7), M (7 – 7 1/4), L (7 1/4 – 7 3/8), XL (7 3/8 7 3/4)Ultralight, low profile design created for active riders. The self-adjusting SureFit Pro comfort system adjusts to the size and shape of your head for an unmatched level of comfort during long hours in the saddle. The geometric visor shape and vent pattern create a sleek silhouette for a flattering eye appealing look.