<b> Helmet Size Chart</b> <br> <br> S 49-50 CM 19.3/19.7 Inch <br> M 51-52 CM 20.1/20.5 Inch <br> L 53-54 CM 20.9/21.3 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.