Use high-grade breathable green friendly mesh fabric.Contains a thin sponge for avoid kidsâ skin get hurt. Soft double layers of hook and loop for kidsâ hands, not easy to take off by themselves.360 degree rotating stainless steel cuff links keep kids safe meanwhile no restrictions on their activities.Soft harness has the function of reflecting at night.wrist link of safe lock, key on adult's wrist.Prevent children unlocking by themselves.