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Do you train jiujitsu? I don’t really see existing uniforms being replaced with something lighter and potentially much thinner.

A much closer application in Jiu Jitsu would be replacing the rash guard that many people wear under their gi, or in nogi. Or replacing a surfer's rash guard, for that matter. Tons of applications for this.

But this is stretchy, which would be mostly an annoyance in training.

I used to practice taekwondo but I just don't see this material being used to replace a standard uniform.