The Stila Stay All Day Smudge Stick Waterproof Eye Liner (£16) is one of our favourite longwearing eyeliner formula — the black and brown hues have been in our makeup bags for years. This month, as part of the brand's summer 2021 collection, the brand introduces four new metallic shades that are perfect for brighter, sunnier weather. From left to right: Jade, Tiger's Eye, and Japser, shown here.