TC asked about the material the deflector was made from. You can buy metal mesh in a metal tubular frame or a glass type one. My suggestion is have a look on eBay you will be able to see the type of deflectors there are.
I've added 2 images for you first one is a glass type and the second is a mesh type hope this helps Stu
I have a mesh one, it can be folded down flat as previously mentioned, and of course the mesh is see through.
The installation involves drilling a couple of holes in the plastic surround behind the seats to mount the support brackets. Don't worry, you get a template with the kit to position the holes.