This video is 8yrs old and with 2 comments including mine and it might be the best video I have seen(after watching many)that explains "breathability" and how it works..thanks..maybe change the title for more hits???

That was the best demo I have ever seen to show physically how it works and not just throw fancy terminology around. That being said, allot of this fabrics are expensive and break down over a few years. How about a fabric that I can use for years to go mountain biking, backpacking and wear to work on a rainy day.

Nice video .

Thanks! a mystery is now solved :)