Too often we hear on the news of children with autism going missing after running off from the parents. I have an autistic son who is a flight risk. This toddler leash has made it possible for us to go to places we couldn't go before: lakes, hiking, camping, etc. It is very comfortable and easy to use. It locks in place easily which gives you a sense of security. The keys are attached to your wrist at all times so there is no worry of losing them. The cushions under the armpit make it so my son isn't rubbing against the harness. All in all this is a wonderful product. I couldn't be happier.