That looks to me like the cord with a plastic sheath at the ankle cuff to tighten them, which camo pants/BDUs have. As the cuffs of the pants are rolled up to try to look "like a badass", the cord is left dangling out and hanging over the sides of the shoes.
(edit: most BDUs are simply wide nylon strings with a knot tied at the ends like this: https://pic8.co/sh/T1niDj.jpeg, but many also have a plastic node at the end that holds the tightness that you pull the strings to.)
That looks to me like the cord with a plastic sheath at the ankle cuff to tighten them, which camo pants/BDUs have. As the cuffs of the pants are rolled up to try to look "like a badass", the cord is left dangling out and hanging over the sides of the shoes.
(edit: most BDUs are simply wide nylon strings with a knot tied at the ends like this: https://pic8.co/sh/T1niDj.jpeg, but many also have a plastic node at the end that holds the tightness that you pull the strings to.)
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