I needed a harness that would allow my rough collie to run, hike, bike and play without being restricted in the shoulders, but would also allow me to gain control of her if needed (she can be a flight risk with certain sounds). I have purchased other harnesses that promised good mobility, but she didn’t move as freely in the shoulders as she does with the Freedom Harness.
She measures 27 inches, so I opted for the medium and it fits beautifully. Adjusting the harness is easy ( following the video they provide helps!) and I love how the clips are protected/semi tucked away as my dog has long hair and this feature keeps me from catching it when I clip her in.