by Mark F » Wed 18 Dec, 2013 9:27 pm
Having a quick read, it sounds like a microporous pu coating - lots of them about and they sit under Goretex, Event in the constellation of wpb technologies. Being developed in 1979 with only a 500mm HH rating I would suggest that it is only minimally "waterproof" and there is no breathability measure provided. You can buy plenty of these types of fabrics from the US DIY suppliers but it is always a bit of a gamble on how it will perform. Many manufacturers use their own name for this type of fabric to try to differentiate their products.
Don't feel that the fabric (type) is not worth using. I have a Marmot jacket using this type of fabric and I am quite happy with it. Toray is a well known weaver of fabrics.
"Perfection is attained not when there is nothing more to add, but when there is nothing more to remove".