On a whim, I bought the one from W*mart made from woven polypropylene. We used it all summer in all kinds of weather. It swept clean easily and dried quickly. Dirt, pine needles, etc. didn't stick to it so it was easy to fold and stow when we left camp after 3 months. We were really glad we had it.
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.