Protect all the skin you’re in. Use a Layered Approach for Sun Protection. Sunscreen works best when used with shade or clothes, and it must be re-applied every 2 hours and after swimming, sweating, or toweling off. Wear a hat, sunglasses, and protective clothing to shield skin. Use broad spectrum sunscreen with at least SPF 15 to protect exposed skin. Seek shade, especially during midday hours.