Keds Milleniums 1981 vintage sneaker ad that features their patented innovative replacement "plug system."
Ad info is below:
HOW ONE PAIR OF KEDS COVERED 2,000 MILES.
Ultra Marathoner Stan Cottrell ran 66 miles a day, 48 days in a row to set a new _ world record: 3,168 miles coast-to-coast in just two pair of Keds Millennium Trainers. He kept this blistering pace without getting a blister, and without wearing himself or his Keds out once. That's durability. But what makes this feat even more incredible is that Stan put over 2,000 miles on one pair alone. In fact, he probably could have gone the entire distance in just one pair of Millenniums had he not needed a spare dry pair to switch into when the going got wet. Keds created the first 2,000 mile running shoe by looking at runners' needs from a common sense point of view.
DURABILITY. The Keds patented wear plug system. We put wear plugs at the critical wear areas of the sole. These SBR rubber wear plugs are constructed of a compound so durable that it 4 received the highest abrasion score in The Runner's World 1979 Shoe Survey. You can replace each wear plug yourself. Additional plugs are available at your local Keds dealer. Men's models: Millennium and Renaissance. Women's models: Phoenix and Seabreeze. STABILITY. A solid external heel counter keeps the foot firmly in place. COOLNESS. New open mesh design works like an air conditioner for the feet. COMFORT. No inside seams mean less chance of painful blistering. Weight. Just 9 Ozs. (Men's Size 9)