This sleek-looking hot tool is the Cloud Nine The Cordless Iron Pro (£349), a cord-free straightening iron that's been 10 years in the making for the brand. The heat styler weighs as much as a smartphone (so, yeah, really light), and stays fully charged for 45 minutes. Great for straightening, curling, or waving your hair, the mineral-infused ceramic plates keep a control temperature of either 160 degrees or 180 degrees.