The first, and best, line of defense against the sun is covering up exposed areas. Wear a hat, sunglasses, and clothing with a tight weave and look for shady spots. Sunscreen works best when applied 15-20 minutes prior to heading outside, every two hours, and after getting out of the pool (towel dry and reapply). It is important to apply enough sunscreen – adults usually need about 1 ounce for good coverage. The most intense sun exposure happens between 10 a.m. and 3 p.m., but since damaging UV rays can penetrate clouds, even on an overcast day, sunscreen is needed. The SPF should be at least 30 and protect against UVA and UVB rays.