nike epic women's training track jacket nike our nike epic women's training track jacket is good for warm-ups or cool downs at track and field and cross country meets as well as road races that keep your athletes comfortable in wearing it. the full-length zipper allows for easy ventilation while zippered hand pockets provide storage for small essentials. the fabric used for the main body is 100% polyester with moisture-wicking fabric and overlock seams. the quality is very good because the materials are carefully chosen and the innovative new styles are wear-tested before they go out to retail, to ensure that it has high quality.