Did you know that it is estimated that approximately 1 out of 5 people in North America will develop some form of Skin Cancer during their lifetime? Sunscreens are chemical agents that help prevent the sun's ultraviolet (UV) radiation from reaching the skin. Most sunscreens with an SPF of 15 or higher do an excellent job of protecting against UVB. SPF — or Sun Protection Factor — is a measure of a sunscreen's ability to prevent UVB from damaging the skin. Here's how it works: If it takes 20 minutes for your unprotected skin to start turning red, using an SPF 15 sunscreen theoretically prevents reddening 15 times longer — about five hours. Children under the age of six months should not be exposed to the sun. Shade and protective clothing are the best ways to protect infants from the sun.