- Nothing is 100%.
- Nothing protects all day for those exercising outdoors.
- Nothing is waterproof or sweat proof. The U.S. FDA defines water-resistant as" maintains it's SPF for 40 minutes when wet".
- On a cloudy day, about 40-80% of the sun's rays reach us. We still need protection.
Check the package for other details such as how often to apply and how much. The sun is to be taken seriously. Unfortunately for many, it takes a skin cancer scare for action. Don't go there!
Resources: ACSM Health and Fitness Journal May 2016 Sun Exposure and Exercise The Good, the Bad, and the Behavior Change by Jeff Lynn, Ph.D: Jordon Urda, Ph.D: and Patricia Pierce, Ph.D..FACSM
American Academy of Dermatology website