Put on the Under Armour UA RUSH Seamless Short-Sleeve Shirt for Men for your most intense runs and workouts, and you'll experience the difference RUSH technology makes. Made with UA RUSH fabric, a mineral-infused fabric that, when the workout shifts into high gear, absorbs your body heat, converts it into infrared energy, and then re-emits it back to you. This localized energy helps increase circulation, which improves your overall performance, endurance, and recovery time. This soft-knit fabric comes equipped with strategically located mesh ventilation panels for constant airflow while you're in motion. Its 4-way-stretch construction moves in every direction for split-second mobility. Plus, this Under Armour workout shirt wicks away moisture and draws it to the surface of the material for fast evaporation and bone-dry comfort. Virtually sew-free, seamless construction adds a smooth, chafe-free feel. The streamlined fit neither tight nor loose feels great. Made of 52% nylon/48% polyester Celliant fabric. Machine wash. Imported. Manufacturer style #: 1361130. Made of 52% nylon/48% polyester Celliant fabric UA RUSH converts body heat into infrared energy Localized IR energy helps increase circulation Improves performance, endurance, and recovery time Virtually sew-free, seamless construction Ventilation panels add constant airflow 4-way-stretch fabric moves with you Moisture-wicking, quick-drying Streamlined fit