Typhoon Helmets Dual Sport Snocross Snowmobile Helmet - Gloss White - Medium Excellent dual sport helmet w/ double pane shield and breath box! Helmet can also be used with goggles (sold separately) by being quickly converted from a shield configuration to a shield-less configuration. Certified to meet the DOT standard (FMVSS218) Please measure for size. Each manufacturers sizing is different. SIZE CHART (Circumference of the largest part of your head, usually just above the eyebrows) in inches SMALL: 21 to 22, MEDIUM: 22 to 22 , LARGE: 22  to 23, XL: 23 to 23 , XXL: 23  to 24. Head shapes can affect how a helmet fits. The size chart is meant to be a starting point. One FREE size exchange! Please measure of size. If helmet does not fit, send it back to us (at YOUR cost) and we will send the new size to you (at OUR cost).