<b>Helmet Size Chart</b> <br> <br> S 53-54 CM 20.9/21.3 Inch <br> M 55-56 CM 21.7/22.0 Inch <br> L 57-58 CM 22.4/22.8 Inch <br> XL 59-60 CM 23.2/23.4 Inch <br> XXL 61-62 CM 23.8/24.1 Inch <br> <b>Helmet Size Tips</b> <br> <br>(1)Wrap a measuring tape around your head about a half-inch above eyebrows <br>(2)Take measurement two to three times to pick the largest one.