Thank you for viewing. This is a chest belt with adjustable length, using Velcro. Chest belt → This is a belt that fastens in front of the chest to prevent the shoulder straps of a backpack from slipping. [Reference] Total length: 21cm - 30cm (assuming belt width of 2.5cm) Total length: 21cm - 27cm (assuming belt width of 5cm) This is made for young children who cannot yet use buckles. With Velcro, it's safe! And they can take it on and off themselves with a "peel-peel" sound ♡ Recently, I've heard that some kindergartens are specifying Velcro-type chest belts. My child went to daycare, so when it came to field trips, they specified a "backpack with a chest belt." Commercially available backpacks, even for babies, usually have buckle types, right?? I was worried about pinching fingers, so I used this Velcro type until my child was about 4 years old. Thanks to that, many children are using it.