![]() ![]() If it lets light through, it probably won’t provide much protection, especially if it’s gauzy or gets wet. To check if an item you already own provides protection, hold it up to a light bulb. ( Can aging be cured? Scientists are giving it a try.) Although most clothing provides more sun protection than going out in bare skin, Brod recommends buying clothes with an Ultraviolet Protection Factor (UPF) of at least 30. Other options include wearing hats with brims at least four inches wide and wearing sun protective clothing. The most effective strategy is to avoid the sun when it is most intense, typically between 10 a.m. But sunscreen is only one part of a more holistic strategy to prevent harmful sun exposure. Very, says Bruce Brod, a dermatologist at the University of Pennsylvania. National Geographic talked to a range of dermatologists to get the lowdown on everything you need to know about sunblock, from A to Zinc oxide. He cites not only the depletion of the ozone layer, the part of the Earth’s atmosphere that helps absorb harmful ultraviolet rays, but also the increasing popularity of outdoor activities such as hiking, kayaking, and cycling. I diagnose it every day in my practice,” says Gregory Papadeas, a dermatologist based in Denver. More questions swirl about the benefits of different types of sunscreens and their relative safety for us and the environment. ![]() In the last several decades, skin experts have stopped wondering if we should be wearing sunscreen (that answer is a resounding yes), but how much, when, and under what circumstances. Over time, however, this sun exposure causes premature skin aging and cancers like melanoma. Most of the time, it leads to several hours or days of pain and discomfort. We’ve all felt it: that moment the warmth of the sun’s rays becomes a bit too warm and the reality hits that we’ve got a sunburn. ![]()
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