"You want to use a volumizing mousse that can give your hair hold and lift. Using your fingers, rake a golf-ball-size puff through your damp roots, then flip the hair over and blast the roots with a blow-dryer for volume. For all-around volume, spray a thickening spray through your mid-lengths to ends before blowing it dry."
Kristin Ess Instant Lift Volumizing Mousse, $14; at Target
The Best Mousse That Makes Every Single Hair Type Look Better
Hint: You abused it when you were in middle school.