Choose your sunscreen wisely: Select one that protects you from both UV-A and UV-B rays. UV-B rays cause sunburns, but UV-A rays also increase your risk for skin cancer.
Use an SPF of at least 30: SPF stands for Sun Protection Factor. Keep in mind that protection provided by an SPF does not increase proportionately with the designated SPF number. SPF 30 absorbs about 97% of the sun's burning rays, while SPF 45 absorbs about 98%. No sunscreen or SPF will completely protect you from the sun.
Apply sunscreen liberally: Apply one ounce of sunscreen (about the size of a ping-pong ball) to every part of your body exposed to the sun. Don't forget the ears, feet and behind the neck. Your skin can take up to 30 minutes to absorb sunscreen, so be sure to apply it about 30 minutes before going outside.
Remember to reapply sunscreen: Once you're outdoors, reapply sunscreen every two hours, or more often if you're swimming or sweating. Even waterproof sunscreen loses its effectiveness due to humidity, perspiration, swimming and uneven application.
Wear lip balm: Apply lip balm with SPF 30 or higher and reapply it every two hours.