While thick, robust watches have their benefits, they often fall prey to door jams and snags on cuffs and jacket pockets alike. More often than not, a truly practical and comfortable watch will also be a thin watch. Among the absolute slimmest — we put the bar at 10mm, including the crystal — the leanness of the stacked parts is a holistic philosophy, depending on everything from the movement to the dial, hands and case. These watches feel wafter thin (because they are) but still look of consequence, and are in fact some of the best dress watches around. For an understated yet stately look that fits under a cuff with heaps of clearance, these six are some of the best.