Static on your dress? Annoying. Static on your head? Even worse. First, why it happens: When the air gets dry, your hair loses electrons (negatively-charged ions) and builds up a positive charge, which makes individual hairs repel each other. They fling upward because they're trying to put as much distance as possible between each other. How to fix it: Moisturize your hair to help its charge remain neutral. But instead of reaching for thick masks and creams, which can weigh hair down or a dryer sheet (who is toting these around, anyway?), invest in a dry oil spray. These formulas are diluted versions of hair oils so they're lighter, but still hydrating. Try OGX Renewing Argan Oil Of Morocco Weightless Healing Dry Oil ($8, ulta.com). Instead of spraying it directly onto your hair, mist it onto your hands or a brush, then run it through strands. Hair will feel softer, look shinier, and be less likely to stand straight up. If you're wearing a hat, wrap your hair into a low bun to help keep it smooth and contained, then undo it when you arrive at your destination.