The only thing about the jaco it's super comfortable and doesn't move but it's not the best for standup only because it's just a plastic cup so if you get hit it'll still hurt. Wear a Thai cup for stand up you can take a soccer kick straight to the nuts and be cool. The jaco is still super comfortable and doesn't shift when striking its just not as good as a steel cup.
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Think. It Ain't Illegal Yet
"Discipline Hurts Less Than Regret"