Avon True Power Stay 24 Hour Foundation Avon's new liquid foundation formula, the Avon True Power Stay 24 Hour Foundation (£10, originally £15) comes in 20 shades (which we hope the brand will add to in the future), and promises to stay put all day long — whether you're a bridesmaid in a wedding and getting your makeup done at 7am, or stuck underground on the hot, sweaty Tube on your way to work. Image Sources: Courtesy of Jo Malone and Courtesy of Chanel