Casio G-Shock G-Steel Layer Guard Black Solar Mens Watch GSTS100G-1BFrom G SHOCK, the watch brand that is constantly setting new standards for timekeeping toughness, comes new G STEEL models, a watch series with a new "Layer Guard Structure*." The GST S100G that combines a solid case with a resin band. The overall black coloring of this model is offset by white hour and minute hands for designs that are chic and cool. A Tough Solar power system ensures virtually uninterrupted operation, while a hand shift feature