With summer in full swing, everyone wants to enjoy the warmer weather. If you spend any time in the sun, it's important to apply sunscreen with the best SPF for your expected time in the sun.
The Sun Protection Factor (SPF) number tells you how long the sun’s UV radiation would take to redden your skin when using the product exactly as directed versus the amount of time without any sunscreen. So ideally, with SPF 30 it would take you 30 times longer to burn than if you weren’t wearing sunscreen.
The Skin Cancer Foundation recommends a water-resistant, broad-spectrum sunscreen (for both UVA and UVB rays) with an SPF of 30 or higher for any extended outdoor activity. Regardless of the SPF, though, it’s important to apply one ounce (two tablespoons) 30 minutes before going outside and reapply it every two hours or immediately after swimming or sweating