HUGE difference between the two material types. When I had mine (a few years ago) the synthetics were like walking in nylon sweat suits. The..swish...swish...swish...swish the material makes when walking, sitting, thinking, and anything else made that material unacceptable when trying to be stealthy. It looked great, but stand in a corn field and listen to the corn leaves and stalks brush against you and every deer in the county knew where you were. Mine was made of the old style felt. Silent, but a burr magnet. I haven't seen the new materials as I'm not in the market, so I can't comment on those. Storage was also an issue for mine. You HAD to store it dry, dry, dry, dry, and dry. Any moisture at all and you had a mold issue with the smell and the material basically fell apart, AKA rotted.