You could argue that a down vest is one of the most important pieces of outerwear a man could own. There's nothing quite as light or remarkably insulating. They keep your core warm and your arms uninhibited, not to mention they make a great pillow on planes or in the great outdoors. What's more, they're the ideal layering piece—over a shirt and tie or sweater, under a jacket or blazer. The real choice is do you want a sporty nylon style or a more refined version cut from soft wool? Sure, a few aren't down filled, just quilted. Either way, these puffers are as durable as they are versatile.