The Under Armour HG Achieve Burnout T-Shirt features soft and super lightweight fabric that keeps you comfortable. The fabric also features a four-way stretch for an improved range of motion as well as a faster drying time. The unique burnout pattern provides for extra breathability and style. Semi-fitted fit. HeatGearŪ is best for weather between 75 and 100 degrees. 71% polyester/29% rayon. Imported.