Troxel Spirit #1 Selling All Purpose Helmet Periwinkle - All Sizes (Medium) The Number One All-Purpose Riding Helmet SEI and CE certification GPS II dial fit System Extended Soft-Tip Visor for Extra Sun Protection Small Up to 22 inches & Up to 7 hat size Medium 22 - 22 3/4 inches & 7 - 7 1/4 hat size Large 23 1/8 + inches & 7 3/8 + hat sizev