When the tunnel toy moved outside it became a favorite spot for Figaro. He had claustrophobia, but somehow it felt safe for him to play and hide in this thing. I don't know how he did it, but he could run very fast trough it, and it is not like it was big enough for him to stand up inside.
Some cats fit better in these... We have resorted to buying ones meant for kids now, so they can run trough and not worm their way around. This thing though, had a long, hard life. It is dead now, but lasted many years.