C.Z.
Tie the shoe like you normally would, but just as you finish making the second "bunny ear," and you tuck the loop through, wrap it loosely around a second time before tucking it through the loop and pulling it tight. (make one "bunny loop," then the second one, and just before pulling tight, go over and then through a second time with the last "bunny ear to pull tight).
It's literally "kidproof" and works wonderfully to keep troublesome laces tied all day long!
My aunt taught this trick to me and it has been a big help with three little ones of my own. Hope it helps.