Well, hello!! If you are not staying under a rock, you must have heard that you need sunscreen to protect your skin from the UVA and UVB rays of the sun. I do not think anyone wants to see their own skin wrinkly and burnt by the sun. A sunscreen of SPF 30 will block 97% of the sun’s rays. A higher SPF will block slightly more UV rays, but there is no sunscreen that will block 100% of the rays. Look for an SPF 30 at least but it is not proven that an SPF 40 or 50 will give you a little bit more protection than the 30.