#458 1971 · Blue Ribbon Sports (Nike) · Footwear
When a new synthetic track at Hayward Field left runners with no grip and no spikes, Bill Bowerman poured liquid rubber into his wife's waffle iron to prototype a tread pattern no shoemaker had been willing to engineer for him
the problem
No shoe sole gripped the new spikeless synthetic track surface
background
In 1971, Bill Bowerman — University of Oregon track coach and co-founder of Blue Ribbon Sports, the Japanese-shoe importer that would become Nike — faced a problem money couldn't fix: a new synthetic urethane track laid at Hayward Field two years earlier was chewing up runners' feet. Metal spikes dug in too deep and slick flats didn't bite at all. He had already asked established shoe manufacturers to engineer a spikeless, high-traction sole; none were interested.
One morning, watching his wife Barbara make breakfast, Bowerman studied the grid on her waffle iron — a 1936 wedding gift — and poured liquid urethane straight into it, gluing it shut and ruining it. He bought secondhand irons and kept experimenting, filing a patent for the resulting multi-sided tread stud in 1972 (granted 1974). Early versions raced at the November 1971 NCAA cross-country meet; the geometry became Nike's first true commercial hit as the 1975 Waffle Trainer.
what everyone would do
Commission a shoe manufacturer or engineering firm to design and tool a new custom sole geometry — the standard product-development path, and the one Bowerman actually tried first by asking established manufacturers to engineer a spikeless, high-traction sole. It failed because commissioning expensive custom tooling for an unproven, unusual geometry is speculative for a manufacturer with no evidence it would work, and none were interested in taking that risk on a coach's hunch.
what they saw
Bowerman saw he didn't need a manufacturer's expensive tooling to test whether a multi-directional tread geometry would even work, he needed a cheap, disposable way to try shapes and see what happened. A waffle iron's grid pattern was already, by coincidence, close to the kind of multi-directional stud geometry he was trying to invent, so using an everyday object as free prototyping tooling let him prove the concept before anyone had to commit real capital to custom manufacturing.
the move
Bowerman used a household waffle iron as free, instant prototyping tooling, pouring liquid urethane into its grid to test a multi-directional, spikeless traction pattern that no shoe company would engineer for him.
why it works
The actual problem required testing many possible tread shapes cheaply, not manufacturing a finished product, and commissioning custom tooling for each variant would have been exactly the prohibitively expensive, speculative ask manufacturers had already declined. A household waffle iron already had a multi-directional grid and could cast liquid urethane into that shape instantly, letting Bowerman produce and test a real, physical prototype in a single morning instead of waiting on a manufacturer's willingness to build custom molds. Once the geometry was proven at an actual NCAA race, he had concrete evidence to justify the expensive, formal steps — the 1972 patent and eventual mass production — which only followed after the cheap kitchen experimentation had already de-risked the idea.
the payoff
The waffle-soled 'Moon Shoe' prototypes never reached mass retail — only a handful sold from Nike's Eugene store — but the geometry Bowerman found in his kitchen was patented in 1974 and released as the 1975 Waffle Trainer, Nike's first bestseller, with orders topping 100,000 units that year. The commercial payoff landed roughly four years after the kitchen experiment, not the two years sometimes claimed.
where it breaks
The approach only works when a genuinely close analog object exists that can approximate the needed geometry or function — Bowerman's waffle iron worked because its shape happened to closely resemble what he was trying to invent, a lucky structural coincidence not every engineering problem will have available. It also depends on the prototyping material and process being simple enough to approximate outside professional tooling — liquid urethane poured into a mold is DIY-friendly, but many manufacturing processes, like precision injection molding or metal casting, can't be approximated with household equivalents no matter how creative the search. And it requires the resulting prototype to be testable in a way that actually validates real-world use — Bowerman could race his prototype at a real meet for direct feedback; a problem whose validation requires expensive, specialized infrastructure wouldn't benefit from a cheap physical prototype the same way.
what came after
The waffle outsole became the founding signature of Nike's product-design culture and is still reissued; the ruined original waffle iron, recovered decades later from a buried rubbish pit on Bowerman's property, now sits in Nike's corporate archives, while the Smithsonian's National Museum of American History holds an original waffle-soled shoe in its permanent collection.
references
- [1]From Waffle Iron to World Stage: The True Story of the Nike Moon ShoeNIKE, Inc. (Department of Nike Archives), 2025about.nike.com
- [2]Bill Bowerman, His Wife's Waffle Iron, Nike's Early Days and Birth of the Modern Running ShoeNatural Running Center, 2011naturalrunningcenter.com