The Seiko Prospex Scuba SBDC003 Sumo, as its name might imply, is a large watch with a sizable 45mm case, and it is quite thick too, at around 13.5mm. Water resistance is 200m, and it meets the ISO 6425 standards for dive watches. It is not unwearable though, even if you have small wrists, as the lugs curve quite pronouncedly. I have 6.5-inch wrists, and though the watch certainly looks big on me, I never felt that it was uncomfortable. The Seiko Prospex Scuba SBDC003 Sumo also comes with lug holes, a boon for those who love swapping straps on their watches.