AS M NK DRY LS FZ PT PACKNike Dri FIT Men's Training Jacket LIGHTWEIGHT STRETCH FOR A LITTLE EXTRA WARMTH. The Nike Dri FIT Jacket is that extra layer you need to keep warm before the sweat starts to flow. The bottom half feels like a soft sweatshirt, and the top half is lighter and stretchy to keep you working out comfortably. Flexible Up Top The upper body, made with light, stretchy fabric, flexes as you move. Grommet vents help keep you from overheating. Soft Down Low The