One thing that the presenter said was "Don't wear cotton".....actually he said it several times.  Do you agree with this advice?  I personally like natural fibers like cotton for layering and nylon for its lightness and water repellancy. A fabric with too high polyester content makes me sweat too much. My body tends to run on the warm side.  I'm going on a mini wilderness hike next month.  So I would be interested in your opinions whether you agree with him or not.
Santacafe
Urban Newbie
Oakland, CA