G-SHOCK GA2100-4A

The Casio G-SHOCK GA2100-4A is a men's analog-digital watch built for everyday wear and genuine G-SHOCK-level toughness in a slim profile. Casio G-SHOCK is known for rugged, shock-resistant watches engineered to survive drops, submersion, and the demands of active daily life. At just 11.8mm thick, the GA2100-4A slips under a shirt cuff as easily as it handles the gym or the job site.

Display: Analog hands over a digital LCD; double LED (Super Illuminator) lights both the dial face and LCD display.
Toughness: Shock resistant via Carbon Core Guard structure; 200M water resistance; mineral glass crystal.
Functions: World time (31 time zones, 48 cities); 1/100-second stopwatch; 24-hour countdown timer; 5 daily alarms; hourly time signal; hand shift; full auto-calendar to 2099.
Case & band: Carbon fiber-reinforced resin case and bezel, resin band; 48.5 x 45.4 x 11.8mm, 51g.
Good to know: The GA2100-4A uses nine distinct shades of red across the case, dial, hands, and band for a fully integrated monochromatic look.
Wear it: Gym sessions, outdoor work, or casual weekends where the watch needs to keep up.