The common denominator between NASA and hair in humid temperatures is this: neither have control over gravity. For flyaways that could give Neil Armstrong a run for his money, however, there is the R+Co Moon Landing Anti-Humidity Spray ($32). During the testing process, every one of us couldn't believe just how well a few mists of this proprietary polymer blend blocked moisture from messing with our style, even across multiple hair textures and heat indexes. In a phrase, this stuff is out of this world.