This is how you prevent running shoe blisters. You can prevent these blisters with a ‘heel lock’ or ‘lace lock’ that creates extra friction between the laces at your ankle. This keeps the ankle and heel area nice and tight, without having to tighten your whole shoe. It also helps to prevent black toenails by keeping your heel and your toes from smashing into the front of your shoe.
The Extra Shoelace Hole
Video by Illumiseen