A rash guard is an expandable shirt that is commonly used by surfers to prevent chafing of the skin on their chest and stomach, and for protection against the sun's harmful rays. It fits tightly and is light and flexible.
Usually made of Lycra, rash guards can also be worn under a wetsuit like an undergarment in order to prevent the formation of a rash. Rashes occur because surfers experience friction between their bodies and the decks of their surfboards, as well as the sticky wax applied on the boards for traction. Long-sleeved as well as short-sleeved rash guards are available in the market today. Most rash guards come in a range of colors.