As you know, sunscreens vary in SPF factor. We recommend using a sunscreen with an SPF between 15 and 50.
No sunscreen can block all UVB rays however, in terms of percentages, a sunscreen with SPF 15 will filter out approximately 93% of the UVB rays you are exposed to, one with SPF 30 keeps out about 97% and an SPF 50 sunscreen block 98%.
These differences might seem small but over a lifetime, it all adds up and if you have a history of skin cancer or are extra sensitive to sunlight, every little bit of protection helps.
An SPF 50+ sunscreen will give you 50 x the sun protection of what you’re skin naturally provides. This level of sunscreen allows a lower amount of damaging UVB rays to penetrate and damage your skin than lower SPF sunscreens. However, it’s important not to take that extra protection for granted. Remember to apply your SPF 50+ sunscreen as regularly as your SPF 30 or SPF 15 to ensure continuous protection throughout the day.