In reply to Sarah Stirling - UKC/UKH:
interesting. in japan its not known as such. i have a lot of japan-specific market stuff from marmot, tnf and mammut and never noticed a difference.
let me know if you find out. will have a look at it.
may be more in the medical market tho. i have a roll of a goretex post-surgical membrane 'borrowed' from a hospital, clearly made in japan.