When the weather turns cold, mittens are essential accessories and a leather pair gives the look a sophisticated edge. As ever, COS reign supreme for luxe basics and minimalist style, with their mittens coming in both black and blue leather. Whistles are the altnerative, with versions in pony skin. KENZO bring their trademark urban cool to the style, with mittens done out with contrasting geometric panels and zips at the top of the fingers. While Marni and Karl Lagerfeld cover their mittens in fur, for a truly decadent vibe. These winter warmers will see you through almost any weather in style.