Chris you are probably just a sweaty bastard! The problems people have with breathable fabrics are that when they are working hard and when the DWR coating wets out NO breathable fabric is particularly breathable any more - working hard, sweating lots = you feel wet straight away and then get wet from sweat.
I have LIVED in goretex etc outside 8-18 hour days, 5 - 6 per week, getting back into the same still damp on the outside gear through London winters and never been anything other than a bit sweaty in the groin (motorbike courier) - if you are not working up a sweat and you stay totally TOTALLY dry (even if you feel a bit sticky).
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