Comfortably increase your performance and recovery time with the KOAR TB300 Regular Fit Short-Sleeve T-Shirt. Designed for high-performance, this regular fit t-shirt is treated with KOAR’s signature Bio Performance Technology. Bio Performance encourages your body’s smallest blood vessels to expand, allowing you to utilize oxygen more efficiently. This helps increase your stamina, keeping you in the game and allowing you to go that extra step. Also, Bio Performance Technology helps manage your body temperature and speed up recovery. The material reacts to your environment, providing a cooling effect in the heat and warming effect in the cold. As you push yourself, lactic acid builds up in your blood. This leads to fatigue, muscle soreness, and potential injuries. This high-performance regular fit t-shirt helps reduce blood lactate, increasing your recovery time. Venting panels promote airflow, keeping you dry during the most-intense activities. 4-way stretch fabric enhances your range of motion, allowing you to maximize your awesome, athletic movement. Looser fitting for comfort and everyday use. Flatlock stitching reduces rubbing and skin irritation, providing a gentle touch and increasing your comfort. UV protection blocks dangerous sun rays and reflective details increase visibility in low-light conditions, allowing you to safely use any time of the day. 100% polyester. Imported.