Not even slightly insulated. If you are looking for something that will actually work well in a winter that has snow and below freezing temps in a regulate basis, this is not it. It is made from flimsy plastic. We fortified the plastic and then actually insulated and it seems like it will work now. 
I’m a little bit stunned that the description insists it is insulated. I’m giving it three stars because it has structure so we were able to make it work with some extra resources and time.