The name rash guard reflects the fact that the shirt protects the wearer against rashes caused by abrasion or by sunburn from extended exposure to the sun. But latest trendy Aqua Lung rash guards can do a lot more that that; they are designed to be worn both in and out of the water while providing full UV protection, ward off jellyfish stings or add an extra layer under your Aqua Lung diving suit. The range offers close-fitting or loose-fit cuts to suit different needs and styles.