9 Layer OSI Model - $20 each Shirt size Small Medium Large X-Large XX-Large XXX-Large  Qty Finally the shirt that tells it like it is! The original Seven Layer OSI model worked for it's time, but times have certainly changed. Politics and Money are certainly at least as important as any of the other seven layers in the new Nine Layer OSI model. (Click on it to get a better view.) (white on black / front design only / all sizes available)