http://articles.mercola.com/sites/articles/archive/2006/06/29/sunscreens-dont-provide-the-protection-they-claim.aspxWhile sunscreens are generally effective at filtering out ultraviolet rays from the sun that cause sunburn (UVB rays), they don't work as well at filtering UVA rays, which penetrate the skin deeply and are more likely to cause skin cancer and wrinklesenCommunityServer 2008.5 SP1 (Build: 31106.3070)