From the One-Step Family of Tools Collection. Power of a Dryer, with Root Boost! Same loved performance, the 1.5" One-Step Root Booster Round Brush Dryer & Styler allows greater control over styling and more versatility in styling options -soft curls, waves, and flips. Synthetic. Imported. 1.5" Round Brush Design allows for close to the root styling for beautiful curls, waves, and defining layers. Boosted by Tourmaline Ionic technology with a ceramic barrel, hair dries evenly, faster with less damage from over-styling. Use on damp hair to dry, style and volumize or alternately use on cool heat setting to refresh your 2nd day hair.