Your sunblock should have a minimum Sun Protection Factor of 15. Cover all sun-exposed skin, from your head to your toes, with sunblock. Don't forget your lips and ears. Reapply your sunblock at least every two hours when outside. Consider using a higher SPF sunblock, such as a 30 or 45, if you plan to be out for several hours.
Protective clothing is also important.
Some manufactures are producing clothing made of fabric that provides SPF 30 protection to those areas covered. Try to stay out of the sun between the hours of 10 a.m. and 4 p.m. because the sun's ultraviolet radiation is most intense during this time. Since we accumulate 80 percent of our lifetime sun-exposure by the age of 20, it is very important to follow these guidelines for your children. Learning to recognize changes in your skin that can signal a problem is vital to early diagnosis, and cure, of skin cancer. Over 90 percent of all skin cancers occur on the sun-exposed parts of the body.