Just wanted to bring an interesting(?) observation about regional differences regarding tent/shelter design. I understand that in the US (and other regions as well I suppose) tents tend to be constructed with one shell/layer which is then complimented by a rainfly or outer shell when/as needed? In Scandinavia (and other regions as well I suppose
) a tent pretty much always has two layers. The outer layer protects against the elements and the inner against mosquitoes and bugs. They are treated as one complete package and many, but not all, are designed so that it is possible to remove one of the layers, usually the inner one. I think that this philosophy comes from us usually tenting above the tree line where it is more common with high winds than not. If you take a look at this instructional video
about how to setup a tent in storm conditions from a Swedish high-end tent making company you can see that functionality in bad weather forms a baseline in Scandinavian tent design.