Mizuno Running Men's Breath Thermo Stretch 1/2 Zip Top Body: 90% Polyester/10% Polyacrylate, top Panel: 87% polyester/13% Polyacrylate, Side Panel: 79% Polyester/14% Polyacrylate/7% Spandex Imported Front Zip with Zipper guard in addition to Superior moisture absorbtion fabric