It's safe to say that anyone who's tried to blow-dry their own hair with a barrel brush has at one point either struggled to juggle both tools, or at least had some hand fatigue while holding them up. The good thing about this Drybar The Double Shot Blow-Dryer Brush ($150) is that both the round brush and the hair dryer are combined into one lightweight, ergonomic tool using the same ionic technology as the already-popular Buttercup.