Learned the Ian knot back in my early 20s (25 years ago now). Pound for pound this is easily in my top 10 highest value things I've ever done/learned. My shoes do NOT come untied anymore, period, ever.

Funny thing is, if you don't know how to tie it, you probably just notice how it looks when it's done (almost exactly like the granny bowtie) so you (understandably) assume it's just a different method to arrive at the same result, like how bunny-ears and rabbit-goes-around-the-tree do. Of course it's not the same result at all.

From the site "The finished Ian Knot is identical to either the Standard Shoelace Knot or the Two Loop Shoelace Knot."