Sturdy material, but the anchors at the corners can be ripped off with the slightest force or wind. After one use, ours ripped off at 2 corners, so we returned it and received another. But we noticed that one was already starting to rip off when we opened it. After the first big wind, it ripped completely off, and so did another one. If you use this somewhere without wind, it's great, but if you ever have wind more than 5-8 MPH, don't count on the anchors being able to hold it down.