High Tech fabric. High Technology micro fiber. Fast drying. It keeps the athlete cool. Rapid absorption of sweat. Mechanical elongation for more comfort. and SPF 50 that acts as a shield against the sun (The treatment for SPF protection is applied from the threads during manufacture, so it lasts much longer Mesh in side panels. Front long zipper. Italian, Azo-Free inks (with components no harmul to skin). Fourth zippered reflective pocket.