slparker wrote:The paper that the wiki cited does not mention softshells...
it seems wrong that a waterproof membrane would transfer vapour better than windstopper but having just got a pertex Air Permeable (similar to eVent, I believe) cycling jacket it seems just as (if not more) 'breathable' than an equivalent windstopper jacket......
windstopper has been around for a long time, its old technology, i'm not sure if or how much its changed over the years, gore tex has changed a lot over the years, it was nowhere near as good as it is today but there werent the similar alternatives when it came out, nothing else that let moisture through was waterproof, at the time it was better than the competition but thats not saying much, event is more recent technology but still not that new but there are different variants of it.
neoshell is easily more breathable than windstopper and its waterproof, i've yet to overload a neoshell with sweat on a dry day, no moisture permeable membrane works well when its raining with a hundred percent humidity outside, and it won't let moisture out at all once the outside of the fabric is wet.
gore tex focused mainly on being waterproof first and breathable second..
some of the other membranes, while being more moisture permeable can be moire prone to letting moisture back in in some conditions, if your thighs rub together the pressure of that can be enough to force water back in through some membranes, if you sit down on the fabric that can force moisture back thorugh, belts and pack straps can create enough pressure to force moisture back through... although the membranes could still be "storm proof" resist the water pressure from rain hitting the fabric up to a relatively high air speed. there are still conitions apart from the rain hitting it where you can still exceed the waterproo hydrostatic head of the membrane.
so the makers spout their laboratory statistics where the membranes are only tested under a limited range of environmental conditions the statistics arent relevant in all the conditions you will come across in the real world. Gore tex saying "guaranteed to keep you dry" is just getting away with a lie that no one has legally challenged to stop them from saying it when they were saying it, i'm not sure that they still are saying it... its marketing hype. i've been rained on long enough and hard enough to know, there is no fabric out there that will keep you dry in all wet weather conditions.. you choose the material relative to the conditions you are going to walk in, some people risk sailing close to the wind to err on the side of bein more moisture and air permeable but not being storm proof and some err on the side of being storm proof and sacrifice the breathability.. Its risk management to a certain extent when you start doing that, you need to know what you're doing and really understand how the fabric will and won't function.
I always have a dry change of clothes for the end of the day, because if its raining a lot, i'm almost guaranteed to need them.