Q: How do I get volume at the top of my head?
A: My mom keeps her Velcro rollers everywhere. You'll get into her car only to find your butt competing with ten pink rollers for seat space. You'll get up off the sofa and find a Velcro roller latched onto your leg. You'll find them in her purse, her golf bag, her glove compartment, and goodness knows where else. Needless to say, my mom's hair is always impeccably voluminous, but the amount of effort she puts into rolling up her damp hair and cooking it in place with a hot blow-dryer isn't always realistic for the average woman.
If you want that slight hit of volume at the crown, already mastered by the likes of my mom and Kate Middleton (yes, I just compared my mom's hair to the duchess's) and you don't have the time for rollers nor a royal budget for (twice? thrice?) weekly blowouts, then you should try Shu Uemura's Volume Maker Invisible Texturizing Powder. The purse-size clickable brush shoots out a silica-based powder, which can be precisely dabbed and rubbed into dry hair on just the areas you want to amp up. Want a little volume right along the hairline by your part? Just brush that powder right up in there. Or, want that perfectly rumpled bedhead look? Hit up that area towards the back of your head. The stuff is totally invisible once it's been fully massaged into your hair with your fingers or brush. The best part is that it also acts as a dry shampoo, so you can make that blowout last for days (meanwhile, bathing is still recommended).
Shu Uemura Volume Maker Invisible Texturizing Powder, $48, Shu Uemura