The walls of my Trekker feel like nylon or some other synthetic fabric with a black rubberized coating on the inside. I went out yesterday and set the darn thing up again, This time I didn't use the stakes that came with it. I went to Wally World and bought 6 heavy duty bright yellow tent stakes. If nothing else, the color will make them easier to find next time the wind flips it over. Then , instead of the guy lines to the 4 corners, I put in 2 dog tie out stakes in front and tied a 3/8 rope to them. The other end of the ropes are tied to a small, elasticized cargo net that was supposed to be used to keep objects on the hitch haul I have for the 4-wheeler. The net is laid over the top of the blind. On the back side is one more dog tie out to the net with the 4th rope going to the fence post. I also intend to pile some loose dirt up around the bottom edges to keep the wind from getting under the walls. I added some corn stalks and I'm ready to try it again. Hopefully the stretch in the cargo net will allow the blind to flex in high winds without going airborne.