Yes, the higher the SPF, the more sun protection you will get.
Probably 5, 10, 15, 20, 25, 30, 35, 40, 25, and 50. Why do they would make lotion like SPF 5 and 10 while they already have SPF 50?
Sun Protection Factor
SPF 50 stands for Sun Protection Factor 50, so if the normal time to get burnt is 20 minutes you will be safe for 50 times that.
The SPF number on a sunscreen label stands for Sun Protection Factor. This means if the SPF is 30, this means you can stay in the sun 30 times longer than you would be able to without wearing sunscreen.
There are different types of skin protection available in different SPF's. But if your wake boarding you should wear an SPF that is not only 40 but that is also water proof.
it means the amount of protection you get from the suns rays
"The sun protection factor of a sunscreen is a laboratory measure of the effectiveness of sunscreen --- the higher the SPF, the more protection a sunscreen offers against UV-B (the ultraviolet radiation that causes sunburn)."
spf stands for sun protection factor
Jojoba oil has an SPF of 4.
It has an SPF of 15 (I know because I have it)
An SPF of about 30