Cotton, whether it's waxed or not, is heavy and absorbs water into the fibers.  Just because you buy something labeled as "upland gear" doesn't mean it's going to hold up to the rigors of todays upland hunting.  We developed PYKE to catch up with what every other outdoor industry was already using.  We combine lightweight fibers with high durability fabrics and DWR treatment to give you a comfortable pant that will last longer that any traditional gear on the market.  You won't want to take them off when the hunt is over.