Hi I would like to get a window safety screen so that Danbi, the little kitten, will not escape through the front window when it gets warmer when the window will be open. He will have access through the back window to the catio when I get one. I saw one few months ago but I can't find it again. I would like one with a zip so I can open the window easily and to let my other cat out. Any suggestions on good ones? What do you have? Ideally I would like it to be £15 or less.