When it comes to sunscreens, don’t buy into this idea: The higher the SPF, the more protected you are from the sun. Dermatologist Dr. Steven Wang says SPF technically maxes out at around 30. And doubling SPF is like doubling up on umbrellas in the rain when one umbrella is enough. Plus, a higher SPF number gives us a false sense of security, so we’re more likely to stay in the sun longer. Instead, reapply sunscreen every two hours, even if you’re sitting in the shade, and wear a hat and other protective clothing when you’re outdoors.