HOW TO maximize your sunscreen protection
Pick a broad-spectrum sunscreen that protects against UV-A and UV-B rays and has a sun protection factor (SPF) of at least 30 and is water resistant.
As a rule of thumb, use an ounce (a handful) to cover your entire body. Use on all parts of your skin exposed to the sun, including the ears, back, shoulders, and the back of the knees and legs. Apply thickly and thoroughly. Be careful when applying sunscreen around the eyes.
Remember to reapply sunscreen after swimming or strenuous exercise.
Apply sunscreen often throughout the day if you work outdoors, and wear hats and protective clothing.