A rash guard is a type of athletic shirt made from stretchy, quick-drying fabric. It is commonly used 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 a popular choice for outdoor activities. These garments come in various styles, including short-sleeve and long-sleeve options, and are often made from materials like spandex and polyester. Rash guards are designed to fit snugly, allowing for ease of movement while providing a layer of protection during physical activities.