Nike Men's Dri-Fit Wool Half-Zip Long Sleeve Running Shirt Body: Dri-FIT 57% polyester/43% wool. Panels: 80% polyester/20% spandex Zipper closure Machine Wash Dri-FIT fabric to wick sweat away and help keep you dry and comfortable Half-zip mock-neck design for custom ventilation and protection from the elements Lightweight mesh lining for enhanced breathability Side panels for enhanced range of motion Body: Dri-FIT 57% polyester/43% wool. Panels: 80% polyester/20% spandex