This sleeveless top is perfect for running at night. Nike Sphere Dry fabric reduces cling and wicks moisture away from the body to keep you dry and comfortable. Straight bottom hem with ergonomic side seams for a superior fit. Mesh fabric inset on back, center front, and sides for excellent ventilation. 1/8 reflective piping on front and back shoulders for added street safety. Tight fitting athletic fit. 94% polyester and 6% spandex. Machine washable.