I run through town early mornings and I got this, the bungee leash and the canicross belt because I wanted to take one of the dogs on a early morning run with me. I have two Labradors. I ordered an XL to fit the youngest lab per the sizing chart, it seems to fit perfect once I adj the straps on the sides. It looks like its well made, time will tell. My older lab is 6, he is taller and weighs more than the younger lab. With the adj straps it fits both dogs. I have used it on a couple of trail runs with the younger lab and already he has it figured out, and he loves it. I have taken him running through town a couple of times, at first he wanted to stop and sniff and pee on everything :) but he has gotten used to the idea that when we take off to run, we are running. If you are a runner who wants to run with your dog this set up is perfect. Its more about you getting used to how to handle the bungee leash and dog than the dog getting used to the harness. I foresee a lot of fun times on the trails and on early morning runs through town. It was a little expensive for the leash, harness and belt but I am happy that I have this because like I said think this is going to allow me to have fun with the dogs esp over the cooler/colder months.