I bought this for my first child while I was pregnant with my second, but they didn't like it, so it's only been tried on and never used outside. This item is useful for preventing children from getting lost or running off. The following is quoted from the website: ■Specifications■ Size: ＜Main body＞ Approximately 150cm in total length ＜Child's side belt＞ Approximately 3.5～4.5cm in diameter ＜Adult's side belt＞ Approximately 5～6.3cm in diameter Wrap the attachment belt around your wrist and adjust the size with the Velcro fastener so that it doesn't come off. #3COINS #3COINS #LostChildPrevention #KidsSafetyGoods