No tie shoelaces

I decided to try no tie shoe laces for my son.  I saw these and decided to try them.  They are made of a stretchy rubber-type material. I thought that they were a stretchy fabric (no I did not read the description) They have anchors on each end to keep them in place, which I think is awesome!  They are a little difficult to get through the holes of the shoe, but they work great.  All in all these do work very well!