I did a lot of research to find the right hat and I am very pleased with my m-series cap! It fits perfectly, nice and snug so it does not feel like it will fly off when it’s windy, yet I barely notice I am wearing it. The sweat band is perfect, prevents pretty much all sweat. It looks great too, and will wear it casually as well as for running. High quality and washes in the washing machine then dries very quickly. Perfect hat!