The largest chair is the XXL which is about 7 feet (2.1 m) across, and seats 2 to 3 adults. It is 84" x 60" and 40" high (uncompressed).
Depends on the chair. A wooden chair is made of wood. and metal chair out of metal... so on and so forth.
Normally wood but you'd have to look at a chair and work out what was on it- eg is the chair you're sitting on wooden?
Wooden chairs are made of wood! Where as plastic chairs are made of metal or steel and Plastic of course
so you can sit in them