Raincry Smooth 2.0 Medium Brush Step one: Pump up the volume. "If your hair is flat, you can quickly prep your style by blow-drying a couple sections above the crown with a medium-sized round brush," Toth said. We like the Raincry Smooth 2.0 Medium Brush ($64), but there are plenty of great hairbrush options out there to choose from. Image Source: shop.nordstrom.com Raincry Smooth 2.0 Medium Brush $64 from shop.nordstrom.com Buy Now