I swear every time I explain the best use of the cool button on the blow dryer, girls are just blown away (See what I did there? Pahhh). It’s not always known that when hair is hot from a styling tool, it doesn’t set completely until it’s cooled down. That’s why sometimes we pin curl hair because we want to curls to fully set. The same principal applies to blow drying your hair! I blow dry my hair upside down until my hair is completely dry, then switch the temperature to cool, press the cool button and blow it over my roots until they are cold to the touch. It sets the volume I’ve achieved from blow drying upside down, giving it a super shiny, bouncy type of volume!