Consider that even with your regular shoelaces double-knotted, you can still step on your heel and squeeze out of your shoes because this action generates a lot of force. These forces are not present when you run. That’s why your shoes stay on. When you run, the shoelaces are mostly lifting the weight of your shoe.
Zubits are engineered to be incredibly strong for their size.
Zubits can hold your shoe secure while running and jumping, but they will split open when you step on your heel because the forces are much greater.
Zubits will also come in four strengths to match your size and use.
Watch the video below!