The Professional is a 43.5mm watch with a Swiss Ronda quartz GMT movement, 300m water resistance and a double domed anti-reflective sapphire crystal. The 316L stainless steel case is 12mm thick with a screw-down crown at 3 o'clock. Pick a GMT or divers bezel, a brushed or DLC matte finish, and a Sea Blue, Midnight, Polar or Grey Ghost dial.