Sturdy. I just purchased a second set of the same (base and half moon umbrella). For anyone to assume that this half moon umbrella and base is supposed to stand alone without tipping over would be non-sense. This is not designed to stand on its own. If one wants to be sure that the halfmoon umbrella doesn't fall over, then couple it with a full round base. I venture to say its purpose is to lean against a stable item such as a wall and offer just enough shade in areas.