It looks like it would fit loosely on a wrist. Not stretchy material but it can be tightened/adjusted.
this post was submitted on 18 Mar 2026
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What is this thing?
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Looks like a pretty shitty prusik loop. Usually used in climbing or other ropes applications. A good prusik would be of a better rope quality and the knots would be more robust but same principle.
more like a fisherman's knot. When you pull on it, they will hold tighter
https://en.wikipedia.org/wiki/Fisherman%27s_knot
Yes, except that it appears to be a double fisherman's, like your example picture from Wikipedia. It's hard to tell, though, tbh.
It's a double. The knot has that nice x-shaped crossover and the end points straight out instead of angling like the single fisherman's bend does before it's pulled up tight.
fisherman's knot always look like that till you tug on the line/rope to lock it tight.
up there in the loop they just used it keep the size adjustable