This interview with Bill Bowerman, published in 1964, predates the running boom, modern high-tech synthetic fabrics, and the boom in dedicated (and revealing) running gear that followed.
Bowerman, of course, was the long-time Oregon (thus the green dye) and US track coach known for his innovative ideas. He might be most famous today for co-founding NIKE and using his wife’s waffle iron to develop prototype outsoles for the company’s shoes.