If styling is part of your regular hair care routine but you aren’t familiar with hair mousse—or only remember what it was like many moons ago—it’s time to be introduced to a modern mousse. With new formulas that add texture and volume without any stiff or sticky residues, today’s hair mousse isn’t the old-school product you may picture in your head. Using a hair mousse can do everything from help to add definition and shape to curls to provide hold to your hairstyle, whether that's a ponytail, braid, or bun. Ready to give hair mousse a try? Keep reading for our guide to all things hair mousse—including what type of mousse to choose for your hair type, how to use it, and some fun styles to try.