Just like Texlon's .75oz, but twice as heavy. It's what you need if you fly a lot in high winds. This heavier fabric holds dye better than .75 ounce ripstop, so the colors are more vibrant. It's easier to paint on, and it's great for flappy things like banners, windsocks, and spinners.

Need to know more about fabric? This article covers a lot of ground!