Here's a size fits like a Large (tag is illegible) VTG Marathon Petroleum Ringer T Shirt......pre-owned in good shape overall,......(measures approx. 23 across by 27 length)...... Marathon Petroleum Corporation is an American petroleum refining, marketing, and transportation company headquartered in Findlay, Ohio. The company was a wholly owned subsidiary of Marathon Oil until a corporate spin-off in 2011.