Originally Posted by Bill Harris
GoreTex is both waterproof and breathable. Anything can be waterproof, but if you don't let the perspired water vapor out, it feels clammy and muggy. GoreTex is a permeable membrane that blocks the entry of large water droplets but allows water vapor to pass through. Dirt "clogs the pores" and it don't breathe.
Google "cleaning goretex" when you get back and settled, there should be a plethora of info on that...
I have been throwing my Goretex lined Motoport jacket in the washer for 15 years now. Still 100% dry on the rainiest days. YMMV.