Revlon One-Step Hair Dryer & Volumizer On Amazon in the US, over 2,400 buyers have reviewed this Revlon One-Step Hair Dryer & Volumizer (£40), and 73 percent of those people gave it a perfect five stars (it's also highly rated on Boots, too). What makes this tool unique is that it's a brush and blow dryer in one product. The oval brush is designed for smoothing the hair, while the round edges create volume. Image Source: boots.com Revlon One-Step Hair Dryer & Volumizer £40 from boots.com Buy Now