These were exactly what I needed! I recently started an 8x4 raised bed in my backyard that was getting invaded by multiple animals. I couldn't find an affordable 8x4 cold frame cover, so to work around this, I bought 2 of these 4x4 cold frames, which did the trick. I didn't realize this until after I already put them together, but you can combine the two 4x4 frames into one long 8x4 with the zippers. I didn't read the instructions though & ended up constructing each one separately and then putting them side by side, which still worked for me. The vinyl is a little wrinkly at first, but it smooths out after some time.