The Revlon One-Step Hair Dryer & Volumizer is an insanely popular hair dryer brush is a best-seller on Amazon that has been ALL OVER social media. It’s got over 5,000 reviews and a 5 star rating. It claims to achieve smooth blowouts in half the time. Its namesake volume is thanks to the ability to easily place the dryer close to the scalp, beneath the hair, for that swingy, salon-coiffed look.