William Joseph Fly Fishing has developed a new wader design, the WST (Wader Safety Technology). The waders contain an inflatable air chamber that surrounds the wearer's chest and can be inflated by either pulling a rip cord to trigger a replacable CO2 cartridge or by manually blowing through an air valve. Marketed as a potential life saver, the buoyancy of the air chamber is enough to keep a large man afloat for an brief period, as evidenced in their Facebook video (link below). I say brief because the seal formed by the inflated chamber around the body is not air-tight, and the waders will still take on water. Although not its marketed method of use, I'm wondering how many people will try to use these waders to cross a river without a boat.