Shoelaces that come undone are an annoyance for athletes, children and their parents, and let’s not forget the children’s sports trainers and coaches
A person with loose shoelaces has to stop and tie their laces all over again even during a match or training, and even more importantly loose shoelaces are also dangerous
To stop shoelaces coming undone people usually tie their laces with a double knot
This makes undoing the knot more difficult so that (not only) children struggle to take their own shoes off
And what’s more it doesn’t solve the problem since double knots can still come undone, even if tied by the parents