The one-of-a-kind BreakFree™ Custom Style Round Brush allows you to adjust airflow and customize your blow-out to meet your styling needs. Simply turn the knob at the top of the brush to allow for more or less airflow through the brush to optimize your styling needs. Adding airflow will speed up your styling time while closing the vents will increase heat distribution for added shaping power. A proprietary VitaBoost® complex is infused into the barrel to enhance styling performance.