#6. SPF — This is the big Kahuna of sunscreen terms. Seeing “SPF” on a package gives you confidence in a product- maybe too much confidence.
Here’s how it works: SPF stands for “sun protection factor”. An SPF 15 means that you can stay in the sun 15X longer without burning. If you start burning after 10 minutes of sun exposure, then a 15 SPF means you can spend 10 x 15 =150 minutes in the sun without burning. But this sounds better than it is.
Many factors affect how much sun protection you actually have in real time– how much you use, if you’re near water or sands which reflects light, as well as heat, humidity and time of year. To me the most interesting things I learned is an SPF 30 is not twice as good a 15 SPF. Who knew?
I think that the best way to view an SPF is as proof that this product has actually been … Continue Reading…