The Casio G-Shock Tough Solar GWA1000D1 wristwatch for men makes the perfect gift for someone in your life who wants a watch that can keep up with their active lifestyle. The black watch case and dial give this Casio a nondescript look while still offering several extra features. Casio designed this watch to have a digital schedule and calendar function, which comes in handy when you forget the date or want to set up a reminder. In addition to the calendar feature, this G-Shock includes luminescent hands and two chronograph subdials. It is also water resistant up to 200 meters. The analog functionality of this men's watch is powered by a reliable solar quartz crystal, so all that is needed to keep it running is a little bit of sunlight.