This article originally appeared on PolitiFact
The numbers that signal summer's approach are here: The countdown to the last day of school. A 90-degree forecast. And, of course, SPF 30. Or 50? Or maybe it's time to break out SPF 100?
SPF stands for sun protection factor. That sounds simple enough, but what these ubiquitous figures mean in practice can be complicated.
We asked two board-certified dermatologists to answer our burning SPF questions.
What do different SPF numbers actually mean?











