Look down at your sneakers. Is there an extra hole for laces that is going unused? Well, there is actually a purpose for that extra hole and it's going to blow your mind.

I never knew this, but apparently the extra hole can prevent blisters on your feet.

In the video below, you 'll see how using the extra hole with your laces can "lock-in" your heal and prevent your feet from slipping in your shoes. It's not quite as simple as just lacing your shoes all the way up. Watch and learn!