With the weather getting warmer ive started opening my windows. I want to open them fully but i live in a 2nd floor flat+dont want my cat to fallout. At the moment i can only have them open slightly to stop him. I also have a balcony door which i also want to open to make the place cooler. My question is what can i buy/do to solve this? Ive tried a lead on him but he hated it. Ive also tried like a mesh but its to much hassle. Just want to know whats the best solution!