The tent fabric is made from 8oz solution-dyed polyester. The fabric has a water-repellent finish on the outside and a coating on the inside that makes it highly water-resistant.  "Solution-dyed" means that the color is actually melted into the raw material when produced. When non-solution dyed fabrics are produce, the dye is applied afterward. Only synthetic fabrics such as polyester or acrylic can be solution dyed. Polyester is preferred over nylon because it does not absorb water, and is much more UV stable.  The fabric manufacturer provides a limited warranty covering "the fabric becoming unserviceable because of loss of color or strength from normal usage and exposure conditions, including sunlight, mildew and atmospheric chemicals." The fabric manufacturer is planning on the fabric being used in a marine environment with 24/7/365 exposure to sun and weather.  And the fabric is made in the U.S. We don't disclose the name because it is really hard to find suitable fabrics. But, at least one other camper manufacturer is also using it.