WHAT IS UVB AND UVA?
>>Back to Top UVB rays produce the familiar sunburn. They also cause skin cancer. SPF (sun protection factor) ratings effectively rate the level of UVB protection provided by sun protection products. The UVB rays have a shorter wavelength meaning that they do not penetrate into the deep layers of the skin. By contrast, UVA rays have a longer wavelength, penetrating deeper into the skin, and produce the aging associated with chronic sun exposure such as: skin sagging, loss of elasticity, pigment changes, deep wrinkles, and dry skin. Recent studies have shown a strong link between UVA rays and the development of melanoma. Critical wavelength (CW) is the international standard to rate the level of protection against UVA rays.
