While there was a leash (more than a month before the MSK), the dog is already used to running and does not run without a leash. The leash itself is quite heavy, I would even say very heavy for running. I'll try it, of course, but as a result, the usual leash roulette is lighter and better. The only negative that it is necessary to carry, but this one is not. Although if the dog with the leash to go down, you have to carry, or wrap around yourself. In general, like many Chinese products, the thing is thought out only in the marketing plan, but extremely not functional in the realities. However, it is executed well, it looks very strong and reliable. I tried to use it and in general everything is very good. The leash holds the dog about two meters. Comfortable handles allow you to adjust the tension. A very large reserve of strength, the leash itself is a beautiful overflowing blue color in combination with black. In the presence of reflective elements. When it is not needed, I just unbutton from the belt and remove it in a running backpack. I shouldn't have been so skeptical and so categorical in the assessment. The thing is good.