These were purchased for my kids shoes but the holes in his shoes were thin rectangular and these fit better for round holes. Clip from s not user friendly for kids to unclip ( I had the headrest time opening it) and the lock is like a child proof medicine cap. You have to push down firmly so holes open up while putting strings through holes. My kid found it difficult to both at the same time so I of course did it. Its done, its on, no more tying shoes but I wouldnt get again.