Study Proves Why Shoes Come Untied

Engineers at UC Berkley find that it isn't human error or the type of knot you use to tie your shoes that are the problem.  They found it's the inevitable force of shoe on the ground that loosens the knot combined with the swinging motion of the loops that leads to the knot becoming untied.  Knotbots solve this problem by preventing the inertia of the laces and keeping the knot tight.

https://www.npr.org/sections/health-shots/2017/04/17/523636317/untangling-the-mystery-of-why-shoelaces-come-untied