Trail running; Hiking 100% polyester Superior quick-drying performance keeps you dry and comfortable. Polygiene® silver-ion technology inhibits bacteria and odor. One-piece construction under the armpits for maximal mobility. Mesh panels in high-sweat zones enhance cooling and breathability. Stretch back panel minimizes exercise-related chafing. Offset shoulder seams disperse pressure points and minimize chafing. Reflective prints enhance visibility during night runs. Ultra-lightweight. Fit: Athletic