This Bathymetric Great Lakes tee shows the depth of the lakes. Show your pride for the world's largest source of fresh water, spanning approximately 4,500 miles of U.S. shark-free coastline alone. The bright colors pop like a neon sign on the dark heather shirt! Make of the tee is 52% Combed Ringspun Cotton / 48% Polyester. Designed and printed by Transit Tees in Chicago's Wicker Park neighborhood.