In the early seventies I lived a few doors down from the guy responsible for developing the floater coat and sea seat concept.His name is Haywood and at the time he was working at UVic. Mustang still makes floater coats as well as a huge variety of survival gear based on information from Mr Haywood's early experiments. They do not, unfortunately know anything about "Sea seats" The late Derek bamforth of pacific canoe base sold sea seats and sadly since his passing they are no longer available..Ecomarine used to sell survival rafts back when John Dowd ran the shop. Once again regrettably these are no longer available The theory behind the design using inflation by mouth is a deliberate means of countering the uncontrolled breathing usually associated with cold water shock Although they can take up to 5 minutes to inflate and require a good deal of agility and upper body strength when used in thier originally intended manner, they are an extemely usefull device. They can be used by a solo paddler as a means of support for resting or re-entry should they become exhausted, incapacitated, or god forbid separated from thier boat. They can also provide support for a rafted tow if there are only two of you etc.... When deployed they are a 3 foot square hi vis orange marker. A device similar to the one once sold by ecomarine is used as part of standard nato submarine escape gear. It is affectionately referred to by submariners as "the coffin"