Round brushes are perfect for blowouts, with large ones recommended for straightening the hair or creating subtle waves, and smaller ones for tighter curls. Thermal brushes can speed up drying as they are made with heat-conducting materials like ceramic, titanium, or tourmaline. Boar bristle brushes help distribute oils from the scalp evenly throughout the hair. They are gentle on all hair types and particularly recommended for people with fine or aging hair. Vented brushes are ideal for quickly drying hair that is still soaking wet as the vents let the hot air from the hair dryer flow through all hair layers.