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I have a 3 year old pair of 680 Pro pants right now.
Well the 5 hole rolls are external on mine for starters. the ab protection is top notch, crotch flex has one small hole in it now from a skate 3 weeks ago, one surface cut.
the protection has been awesome no complaints...nice tail bone padding as well and kidney.
I know squat about the rbk pant so can offer you nothing on those or even to compair.
I can say that I just ordered Itech Hppros and level of pading is comperable, mobility inthe itech seems better but that is because i have out waisted my koho's...lol
the koho is nice pant. All i can say is if you play in a league that is NHL picky find out if the koho meets requirements.
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