I found this harness on sale around Christmas time. I have a small kitten who is determined to go outside, so I ordered this instead of a collar to keep him secure. Overall, I think it's a very great little harness. The medium size is exactly as described. My kitten weighs between 5-6 pounds and on the smallest settings of the harness, it fits him nicely. He still manages to get his front arm free sometimes, but overall, there's not really an issue. It sort of serves as a shirt of sorts for him See full review