Once you know the difference between a "sunscreen" and a "sunblock" you will know just how important using #1 is. A sunscreen is made up of chemicals that must be absorbed into the skin in order to absorb UV energy. Most sunscreens protect from UVB, (the burning ray) but not from UVA (the aging rays). A "Sunblock" (like mineral pro SPF 30+) is made of 20% zinc oxide, a natural mineral that sits on the surface of the skin to reflect UV energy away from the skin, giving you broad spectrum protection against burning and Aging. Of course this wonderful product is available at Skin Perfection all year long.