A rash guard is a type of athletic shirt made from stretchy, quick-drying fabric, commonly used in water sports like surfing, swimming, and paddleboarding. It provides protection against rashes caused by abrasion from surfboards or wetsuits, as well as harmful UV rays from the sun. Rash guards are typically fitted and can be worn alone or under other clothing. These garments come in various styles, including short-sleeve and long-sleeve options, and are often made from materials like spandex and polyester. Many rash guards also feature designs or logos from popular brands in the surfing and water sports communities, making them both functional and stylish.