AXEN 30PCS Plastic Cord Lock End Toggle Double Hole Spring Stopper Fastener Toggles for Shoelaces, Drawstrings, Paracord, Bags, Clothing and More, Black
Bought these because my kid still has not learned to tie shoe laces. I have these on the shoes and then we tie laces per usual. if the shoelace comes undone, it won't cause the shoe to get loose at least.