A compression shirt is a tight-fitting garment designed to apply pressure to the muscles and skin, typically made from stretchy, elastic fabrics like spandex, Lycra, or nylon. It provides support for the body by improving circulation, reducing muscle fatigue, and aiding recovery. These shirts are form-fitting and often feature moisture-wicking properties to keep the wearer dry. Compression shirts can also help with posture and reduce soreness after physical activity, making them popular among athletes and those recovering from injury. They come in various styles, including short-sleeve and long-sleeve options.