Sun Blade - with MeshDesigned by the wind and built for high speed activity, the SUN BLADE HAT WITH MESH maintains superior (UPF 50) sun protection while other hats are blown away. No more flip flopping with every breeze! Our flexible, foam brim features a two way, deep curve design that keeps your hat on top where it belongs. The strategically placed 3D mesh keeps fabric off your skin and provides cooling ventilation. Sizing S M circumference is 57cm L XL circumference