Ultraviolet (UV) rays cause significant damage to the skin. In the short-term, over-exposure to the sun causes sunburn, which is uncomfortable and causes immediate harm to skin cells. Over a longer period of time, UVA and UVB rays damage collagen fibers and reduce the amount of vitamin A in the skin. As a result, skin becomes uneven in tone and begins to sag. Fine lines, wrinkles, and blemishes begin to form. The iS Clinical In Sun range has been developed by a leading team of scientists and skin care physicians to shield the skin from harmful UV rays. iS Clinical In Sun products also nurture and treat the skin, repairing previous damage and improving the complexion.