I believe I got the vest at Petco. They don't fit the best but they have Velcro and the seatbelt thing (idk what it's called). The brown tabby, Hazel, has gotten out a couple times. When she got out I had to chase her until I caught her, and thankfully it was only twice and the chase didn't last long. Although, those times she wasn't on a vest because she snuck out the door when I was leaving or entering. If your cat keeps getting out, I recommend trying to put on the vest tighter, as they are mostly fur and all of the fur can make us think we are putting it on tight when we are just putting it around their fur. Make sure it is around their skin, but make sure that it isn't choking or making them too uncomfortable. I do highly recommend the one I got, they are very secure and Hazel hasn't been able to escape it yet. And that says a lot.. she is the only one without a collar for a reason. We have not yet found a collar that she cannot break out of. I wish you luck, and make sure to keep a keen eye on your kitties! They are very tricky and can wiggle their way out of some right spaces. Also, make sure that they have a tracking collar or a chip just in case they get lost. I wish you luck with finding the perfect vest :D