4 Which of the following best describes the materials the company uses to make its footwear?
a Synthetic fibers, waterproof polyesters, microfibers, rubber, and metal eyelets
b Natural and man-made fibers, durable rubber, waterproof fabrics, synthetic fiber shoelaces, and high-strength threads
c Waterproof fabrics, rubber, cotton shoelaces, and fiberglass thread
d Standard and superior materials
e Normal-wear and long-wear materials