You could fold yourself into a pretzel and you still wouldn't be able to see through the Horizon Water The Nitrogen Leggings (£70, originally £93), the fabric (which is made from recycled fibre made from abandoned fishing nets and various other post consumer waste) is that opaque. "They're also some of the most comfortable leggings I've ever worn," says content director Sophia Panych. "They have the perfect amount of stretch and I love that the wide waistband isn't supertight, which makes them great for both spinning and pilates." The only thing they don't offer any compression, which not everyone is looking for, but if you are, these may not be your best option.