SOCIAL MEDIA users are only just realising what the extra hole in their trainers is for.
For years, many couldn't fathom what the extra hole's purpose was.
TikTok user Nico Felich has enlightened anyone that didn't know, however, explaining that the hole is called a heel lock.
The heel lock allows show owners to tie their trainers into a "runner's loop".
This enables show owners to create two extra loops with their laces, creating a tighter fit.
Using a runner's loop allows joggers to keep their feet in place, preventing any slipping around the heel.
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Seeing Nico's post, many TikTok users were left stunned by this development.
One commented: "I never knew this, thanks!"
While a second wrote: "I never knew."
A third gushed: "Wow! Just learned something new 👍 this should definitely help."
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Another added: "I used to run when I was younger and I sure did not know this. Thank you!"
Others pointed out another useful way that the runner's loop can be deployed.
One wrote: "If you play hockey and struggle tying your laces you can do this and it makes it way easier too!"
Another similarly added: "I use that on my hockey skates."
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