Hi Karl,
Cordura is basically canvas, so its probably going to be cold when wet.
A few friends of mine wear quick dry pants with poly thermals underneath, personally I find that uncomfortable.
Hi, "Cordura" is a trade marked product made by Dupont.
The fabric is Nylon face fabric, with Urethane liquid membrane applied inside, make it waterproof.. which it kind of does until it wears of by abrasion delamination from oils.
Face fabric is highly abrasion resistant.
Canvas is a solid, through fabric made of a pure cotton (uncommon these days).
Now cotton is blended with polycotton, polyester, Nylon or other fabrics, use specific.
Sails, tents, backpacks, Ute covers.
It is far more rot restsitant than pure cotton which deteriorates due to mould/ fungus.
Primary advantage is that it will "breathe" allowing whatever inside to dry through micro holes. When wet, weft swells and makes it waterproof.