Definitely NOT heavy duty. As we were putting it together, getting the tarp pulled down over the poles, a light wind threatened to carry off the whole thing. We hung onto it to keep it from flying into the neighbor's yard, only to have the poles bend to the point of being useless. We were never able to finish setting it up and wound up relying on patio umbrellas instead. Don't bother with this unless you're absolutely assured you won't have even the lightest wind.