First, Welcome to the site. To answer your question, I'd recommend wool pants. Wool would come the closest to the requirements you had. They are silent in the brush, are comfortable in the temperature range you gave, (although 80 deg. might be a bit warm). Will shed water up to a point, And if they get wet, they'll still be warm. You mentioned 2 pair. Get a heavier pair for cooler conditions and a lighter pair for warmer weather.