Can't compare apples with pears really. 3 layer gore-tex of similar weight to gelanots will be just as friable. I have matching Sprayaway gore-tex Torridon Jacket and overtrousers which I bought 24 years ago when I lived in Blackburn. Still fine, except need to send jacket for retaping to LSR (always the jacket, never the trousers eh). But I could never pack them down into a bumbag, or run comfortably with them.