OH! super easy fix. When you make the first loop, take the other lace and loop it TWICE instead of just once. Your shoelaces will never come untied again. I played baseball for years and my laces would come undone and my coach showed me this method. It has worked for me for 35+ years since I learned and I use it for everything.....sweatpants, shoes, hoodies, anything with laces. Good luck!