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KU's iconic "Rock Chalk" chant was first adopted by the university's science club in 1886 and further developed by Professor E.H.S. Bailey and colleagues in 1889. Today, the "Rock Chalk" chant can be heard throughout Lawrence, KS, and most commonly heard by losing opponents in Allen Fieldhouse. Rock Chalk it up with this KU hoodie! Made of 50% Polyester, 38% Cotton, 12% Rayon.