I bought the belt to secure the "not quite first steps" of our 14 month old daughter outdoors. And I am very satisfied. The belt is kept fairly simple but perfectly adequate for its purpose. I'm 1.96 and our daughter is 83cm. This is just enough so that I need only very slightly bend the side, if it is to keep my fingers in order to run. You also runs quite safe both on one hand and by private treaty, and in the apartment, we have cork floor, there is no problem if it times stoplert and falls, which occurs naturally from time to time. Since they now but will also run out and I have a spinal disc damage, I've been looking for a way to let be a little less hard many small falls my daughter and for not always having to hold them by an arm / one hand what me after a few minutes strong beats on his back. And that is why the belt is great. She loves to attract him and plays around with it otherwise in advance, if they get it in their hands. And it also looks quite nice when our daughter who created the belt. If she is now running outside on concrete / asphalt / stones or something hard and rough, then I put her still fast the "dopplete leash" and already she can walk freehand, bend over, pick up stones and move otherwise freely. When they once stumbles and falls, then I can easily catch in traps, so that they only "gently falls on hard and rough ground / slips". And because the belt then yes rests below her shoulders and on her chest, it does not hurt her even if it is "held up" by the belt. Yesterday we played together with grandma and grandpa even "football". Has all great fun. Especially our daughter. And because it was so warm, arms and legs were of course wearing only briefly. And totzt the many stumbles and falls that belong with such a wild game to there was no scarring ;-) Something would only "take the hands" not have been possible.
Of course, a child is not to drive a dog and a child on a leash is safe "morally questionable". But I believe that there is more freedom of the child when running at hand and for all parties is just more convenient and healthier.