Perhaps 3 is used by the Japanese traditional breathhold divers (usually women) who harvest marine life for a living. These divers usually wear goggles, not masks or snorkels. There is a flap for the mouth for breathing. Perhaps 2 is used by these same kinds of divers who use masks instead of goggles. The undersuit looks like a rebranded Weezle from the UK.The hood choices, wow. No. 2 looks like a pumpkin and No. 3, I have no idea what to make of that.