You use straightening mousse if you want your hair to stay straight all day. This mousse works by weighing down the hair follicles, and locking out moisture from sweat, rain and humidity to prevent curl or frizz from creeping in. If you're going to be flat ironing hair, prep beforehand with a good straightening mousse. If you have naturally straight hair that's prone to frizz in humidity, slather on a bit of this before you blow dry to see how it does.

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Budget Friendly Straightening Mousse: John Freida Take Charge Style-Managing Mousse

This mousse gives you the best of both worlds. Straighten hair, or change your mind, and scrunch and air dry for curls. Whatever your mood, this mousse lets you choose your style. Leaves hair silky and smooth, plus, it's alcohol-free. Typically $6 or so.

Upper Cusp Straightening Mousse: Caviar Non-Aerosol Mousse by Alterna

Now you can get the control you need over your hair without the aerosol container. This mousse is light and airy, and gives lasting hold and protection from heat styling. It's free of parabens, gluten, synthetic color, DEA, TEA and a host of other troubling chemical ingredients. Plus, Caviar hair products are clinicially proven to reduce the signs of aging in hair. After just one use, you'll notice improved texture, shine and softness. $28, but prices may vary by location