We’ve looked at a lot of car harness/restraint options and this is by far the best quality we’ve come across. It’s tested in the lab, which we appreciate so much, and you can feel how sturdy the harness is when you handle and adjust it. It was simple to fit, easy to get on/off, even when your dog is leashed up to a harness underneath - there’s no need to unclip the leash to do so. We were a bit skeptical about the sizing, but it’s accurate - we have a 24 lb Cairn Terrier and went with the XS based on the measurements we took. Fits like a glove with room to loosen and tighten depending on how hairy he gets. 10/10 recommend.