When the Zubits magnets are separated it’s as if you have no shoelaces at all, so you can easily slide into a wide open shoe. Then, just click the magnets together and that’s it! Go for a run. Afterwards, just step on your heel and pop out of your shoes hands-free. SIZE #1 is recommended for ages 5-7 but also for elders or light walking. SIZE #2 is recommended for ages 8 to adult for most activity including jogging. SIZE #3 is recommended for recreational sports, performance, large adults over 190lbs, or for tight lacing. Zubits no tie shoelaces can be used over and over again which makes them the best solution and the best value. They lace onto your shoes using your own shoelaces. Instructions are included along with special clips to secure your shoelace ends.