This is an article from Today.com and with summer hear we all need to take note of this information if we plan on being in the sun.
1, Yes, SPF matters – Go for SPF 40 or above and apply liberally
Let's start with the basics. While Consumer Reports recently discovered that some SPF 60+ sunscreens didn't meet the claim on their label, you should still pay attention to that little number on the bottle. Use SPF 40+ as a benchmark and apply liberally (more on that later) to help reduce your chances of reddening, sunburn, wrinkles, liver spots, skin sagging and, most of all, skin cancer.
Equally as important? The amount of UVA and UVB protection listed. It's not hype at all! UVA and UVB rays cause different types of damage; Generally speaking, UVB rays cause sunburn, and UVA cause deeper, longer-term damage like wrinkles. "Both UVA and UVB contribute to skin cancer, so it's important to have a sunscreen that can block both
SPF stands for 'sun protection factor' and is a rough measure of how well the sunscreen can keep your skin from getting damaged by the sun. SPF 50 blocks 98 percent of the rays attacking your skin, and lower SPFs block less.