Under Armour Lady Achieve Tank Top Vest Lightweight Fabric - Soft and light, designed to keep you comfortable in and out of the gym. 4 Way Stretch Construction - Helps to improve your range of motion and enhance breathability. Moisture Management - The fabric helps to wick sweat to keep you cool and comfortable. Knotted Racerback - Reduces fabric bulk, enhancing comfort and performance. Shaped Hem - Enhances coverage and offers a slimline fitting.