Water causes frizz, and it doesn’t take much, so as humidity heats up, arm yourself! The goal of every anti-frizz product on the market is to create a barrier to keep moisture from breaking the hydrogen bonds that keep your hair in position. But all anti-frizz products are not created equal. For fine hair, the light mist in a spray delivers less product, so hair won’t get weighed down. Thick, coarse hair, on the other hand, can tolerate a heavier product.