When the mercury drops, so too does our tolerance for anything scratchy, flimsy or faintly apologetic in the warmth department. This is the moment, then, when hats and snoods really come into their own. Whether spun from cloud-soft cashmere or wool, the best winter warmers bring the cocooning calm we crave. From beanies to hoods and snoods, these are the pieces that take the edge off even the bleakest midwinter commute. Here, our pick of the cosiest companions to pull on now and rely on until spring shows up.