Jen,

The "catio" is sturdy and is held in by the window. I've had as many as 2 cats in it and have never had a problem. It stays in the window the same way a small air conditioner does. I put a small block of wood underneath it on the outside of the window on the ledge. I bought it online from Petco or PetSmart, I can't remember. I've had it for quite sometime now. It's WELL worth the money, IMO. The best place to put it is in a window that has alot of action (traffic, birds, people, etc.) It comes with a removable plexiglass panel to keep out rain and stuff. There is one panel in there with small openings for air flow. I went out and bought a piece of screen to put over the panel to prevent mosquitoes and flies coming into the house. I applied it with strips of velcro.

Miss Meow,

Both red and green!

Barbara,

Start peeling !!