A rashguard is a type of athletic shirt made of spandex and nylon or polyester. Mens Rashguards are used for light coverage in warm to extreme summer temperatures for several watersports including surfing, scuba diving, snorkelling, wakeboarding, body surfing, body boarding, windsurfing and kayaking. A Mens Rashguard provides some coverage from sunlight to prevent sunburn. Many have a 25-35 SPF rating to help block out ultraviolet rays from the sun. A Mens Rash Guards also provides some protection to the skin in watersports from a "rash" or irritation caused by rapid impact with surface water or a wave.In surfing, a rashguard offers protection not only from the sun, but also from irritation and rash caused by sliding up on the board, furthermore, it may also offer some protection against jelly fish. Mens Rash Guards are also worn under wetsuits to prevent chafing.