The Nike Boxy Tank Top: Comfort, mile after mile. The Nike Boxy Women's Running Tank Top is made with sweat-wicking fabric and an unrestricted fit for total comfort during a workout. Benefits. Dri-FIT fabric to wick sweat away and help keep you dry and comfortable. Scoop neck and wide armholes for loose-fitting comfort. Racerback wide range of motion. Additional Details. Fabric: Dri-FIT 100% polyester. Machine wash. Imported.