A rash guard is a type of athletic shirt made from stretchy, quick-drying fabric. It is commonly worn in water sports like surfing, swimming, and paddleboarding to protect the skin from rashes caused by abrasion against surfboards or wetsuits. Rash guards also provide some protection from harmful UV rays, making them popular for outdoor activities. These garments come in various styles, including short-sleeve and long-sleeve options, and are often made from materials like polyester or spandex. Many athletes choose to wear rash guards for added comfort and to help regulate body temperature during physical activities, especially in water.