While lathering up with SPF is an easy and important task, there’s a lot about the process that is difficult to comprehend. For starters, what do those SPF numbers even indicate? And which one should you actually be using? They climb all the way up to 100—but is that truly necessary, especially when many brands are selling moisturizers and sunblocks with SPF 15?
We fielded these questions and more to a group of board-certified dermatologists to get some clarity on SPF and the standards we should set when buying and applying it.
As it turns out, it’s not all about the SPF number, which itself can mislead most consumers. But let’s start there: