Your tent is designed to strike a balance of breathability and weather resistance. The rainfly is treated with a waterproof (Polyurethane) coating to keep the wet out. The tent body is designed to maximize breathability, and thus limit condensation. So if it’s wet outside, use the rainfly.
Still can't find what you are looking for, no problem you can contact Support here, or by calling 888-925-4621 M-F from 7 to 4 PT.