I seriously question the wisdom of giving something like this to kid in martial arts to wear. What a great big, honking thing to grab and choke the wearer with. By the time a student would be in a position of using it, they would be in a position of being choked by it. Bad idea on the sensei's part.

I say this as a holder of a Black Belt.

YMMV

My $.02
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"Its not a matter of being ready as it is being prepared" -- B. E. J. Taylor