The g-shock ga2100 models inherit the octagonal form from what was employed for the original dw-5000c. Analog-digital timekeeping comes packed into a no-nonsense, simple design without sacrificing g-shock-level toughness. High-strength resin material reinforced with carbon fibers makes it possible to create a case that is a mere 11. 8 mm thin, which is the thinnest among g-shock combination models. The men's watch also boasts 200-meter water resistance, shock resistance, and a double led light. Casio G-SHOCK Analog-Digital Men's Watch GA2100-4A