As important as SPF is, it's still one of those things that is an afterthought for many. And we get it. In the past, formulas were sticky, oily, and often left white residue. But no more. With so many advanced formulas out there, there's really no excuse not to make SPF a mainstay in your beauty bag as well as your beach bag. Click on to see five sunscreens that boast a zero white residue.