G-Shock Watch Midnight Fog Series Mens GM-S2100MF-1AER. The G-Shock Mystic Fog series, envoking the feel of a foggy night in a city, includes the GM-S2100MF-1AER model with a metal case, a black IP stainless steel bezel and a semi transparent strap. These series of watches features softer colourways and matte skeleton style straps for a subtle and understated finish. Still 200M water resistant with functions such as World Time, Stopwatch and a Timer.