Same thought here about the tritech being limber, still my fav tho. Have u seen this the buck ridge line? It's toward the bottom
http://www.wesspur.com/fliplines/non-steel-core.html
Just thought I'd share, Ive been wearing these a few weeks now and love em. Stretch canvass, double knees, complete freedom of movement u don't even know they are on and a good fit. They are light weight but actually holding up better so far vs my regular thick canvass pants. U can find them...