DUDE!!! I get my PK pants there. These things are great. Thin, tight woven cotton fabric make them light and feel a little crisp to the touch, but the style is pretty unobtrusive, which is just how I like them. You don't really need stretchability on these things, though I get mine to be a bit bigger than I need. All in all, freedom of movement made with pretty solid fabric, at only $17.99. Love these things.
They're the darkish green or light khaki dickies cargo pants that are woven to make small squares on the fabric.