The Urban Dictionary says CAT 6 racing or "hipster racing" refers to commuter cyclists who race one another during their commutes to work. As opposed to CAT 5 roadbike racing, CAT 6 racing starts when a stranger riding a bike tries to pass another cyclist and the other cyclist speeds up rather than let them pass. This creates an impromptu "hipster race."
Heavy Metal Grey shirt with white graphic. Shirts are 100% soft cotton.