Memories of white-nosed beach lifeguards may have caused you to shy away from natural sunscreens in the past. However, finely milled formulas contain mineral ingredients that block skin-aging UVA rays and sunburn-causing UVB rays without making you look ghostly. They're also better for you than traditional sunscreens because of what they don’t contain: questionable chemicals (such as the hormone-disruptor and possible carcinogen oxybenzone, used in many traditional formulas) that may harm your health and the health of the planet, as the runoff from swimming and showering makes its way into waterways. Mineral sunscreens are an intelligent choice for you as well as the environment, according to an investigation by the Washington, D.C.-based nonprofit scientific research organization Environmental Working Group. The newest natural options are irritant-free and don't cast off harmful residues. Arm yourself with a broad-spectrum, chemical-free sunscreen (like the ones on the next 4 pages) that contains Food and Drug Administration-approved strong UVA filters titanium dioxide or zinc oxide and SPF of at least 30. Your skin—and the planet—will thank you.