My dark cloth is made from a two-ply Gortex fabric, available at Rockywoods Outdoor Fabrics in Loveland, Colorado. It is super lightweight, breathable, and waterproof. Black on one side and white on the other. The inside we lined with an opaque black china silk. It is half the weight of my old horse blanket. We added a couple of small pockets on two corners to add flat sinkers when wind becomes an issue, a piece of elastic to keep it snug around the camera back and velcro closures. Works great!