There are 2 types of UV Rays projected from the Sun, UVA and UVB. UVA rays damage skin cells in the basal layer of the epidermis, where most skin cancers occur. UVAs penetrate deeper into skin tissue where they release free radicals, damaging skin cells, promoting skin aging and causing skin cancer. UVB rays stimulate the production of new melanin and a thicker epidermis, which are your body’s natural defense against UVA damage. UVB rays cause sunburns, the body’s natural warning system against UVA damage. It is essential to use a product to protect you from both rays to prevent not only a sunburn but further damage resulting in skin cancers.