A couple of decades ago when a diver was dirty (hasn't off gassed), they would flip their shirts inside out. Back in the day they had two-sided shirts, one being yellow and the other being blue. As an ode to those days, I did a far out 70's octopus on a Navy Blue Ringer Tee! This shirt also has a very vintage 15 Fathoms breast logo. This tee was created to honor all those old schoolers who wore the two-sided blue and golds and set the bar high for all of us younger divers.