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No idea. Probably because they want to keep the fabrics they are using close to their chest.
I found that it was quite breathable - I was wearing (what I consider to be) quite a lot underneath too; gabba, armwarmers, baselayer, tights that come up very high and bib straps etc. Was impressed - no way could I have worn my old Gore Paclite jacket over all that without melting.
dan
skinny
Why don't Rapha publish waterproof and breath ability ratings on their garments?