It’s cold and cloudy, so you can retire your sunscreen until sunny days at the beach this summer, right? Wrong, says Debra Jaliman, MD, a New York City–based dermatologist. “The sun and UV rays are present winter, spring, summer and fall,” she says. “I recommend that you wear a sunscreen with SPF 30, and it’s best to wear a UVA/UVB blocker. The best ones contain zinc or titanium.”