1. Use an egg-size amount of mousse. Mousse gets a bad rap because of its crunchy ’90s past, but mousse is key for adding volume to otherwise limp hair. Start off with an egg-size dollop in your hand (hair stylist Mark Townsend says this is a good amount if you have fine hair), and then work it evenly through damp hair, roots to ends, before blow drying.
2. Use your fingers first instead of a comb or brush when blow drying your hair. To get the majority of water out of your strands, use your fingers like a comb and lightly rake your hair up and away from your head as you blow it dry (concentrating the nozzle at the root, directing the air flow toward the ends to help smooth the cuticle down; otherwise you can create frizz). Pulling your hair away from your scalp with your fingers (rather than blow drying it flat against your head) creates a fuller result, because as you lift and heat your roots simultaneously, you build volume. Finally, go back through with a big round brush to finish styling it.