I don't what it is exactly called but it's a leather leash that is tied to the toddler so he wouldn't get lost when the toddler and the parents are roaming the park or the mall. Is that leash a good idea to be used on toddlers? Someone remarked that the toddler is like a dog with a leash huh. In fairness to parents who use the leash, there are toddlers who are really unruly even when in public places. So I guess the leash is much better than letting their toddlers be unruly.