Asics Hydrology T-Back Running Tank - The ASICS® Hydrology® T-Back Running Tank is made with a breathable polyester fabric that has a soft feel and offers quick distribution of moisture away from the skin to keep your body dry, comfortable, and better able to regulate temperature. Fabric also provides breathability and air circulation. Loose T-back design is perfect for layering over running bras. Sculpted side seams offer a flattering fit. Reflective elements add increased visibility. 100% polyester. Imported.