Dive Skins primary purpose are to protect you from stings, abrasions, and sunburn. Dive Skins and Rash Guards are bloody thin and appropriate only when diving in warm water. A Dive Skin is usually made out of Spandex or Lycra material. Rash Guards, more commonly referred to as rashies or rashys, are said to have originated here in Australia. They also offer sun protection by blocking some Ultraviolet Rays. Surfers benefit from wearing a Rashy too, as it helps to prevent irritation caused by impact with surface water and waves, as well as prevents chafing from sliding on and off of a surfboard.