The Cortez, however, was just the first of Bowerman's celebrated inventions, which came to comprise eight registered patents, including shoes with an external heel counter, improved spike placement and a cushioned spike plate. It was also just the first success in his enduring quest to create the lightest running shoe possible.
"He thought running shoes could be better", Nike's first full-time employee Jeff Johnson says about Bowerman's early innovations. "He challenged accepted notions of traction, cushioning, biomechanics and even of anatomy itself".
Bowerman next sought to manifest a shoe with excellent traction on multiple surfaces, without metal spikes. The solution came over breakfast in 1970, as he contemplated the syrup-cradling depressions of the waffle on his plate. "What if you reversed the pattern and formed a material with raised waffle-grid nubs?", he wondered. He subsequently commandeered the family waffle maker and substituted batter for melted urethane. Unfortunately, Bowerman initially forgot to grease the waffle maker with an anti-stick agent, and it glued shut. Despite this setback, he persevered and fashioned a flexible, springy and lightweight rubber material with a raised, gridded pattern and grip traction.
The Blue Ribbon Sports crew raced to debut the Waffle sole at the upcoming 1972 US Olympic athletics trials in Eugene. They had nylon uppers flown in from Japan to pair with Waffle soles hand-cut from sheets of rubber made in Eugene. Early Blue Ribbon Sports employee Geoff Hollister glued the components together, creating shoes for a handful of trial competitors to wear during training or on the infield at the Hayward Field athletics stadium.
The hand-built shoes were dubbed the Moon Shoe due to the distinctive imprint they made in the dirt, which resembled the lunar footprints left behind by American astronauts during the era's historic Apollo missions. The first iterations were crude, but runners liked the feel and traction of the Waffle sole and word of the invention quickly spread. Bowerman further refined the concept and developed the iconic Waffle Trainer in 1974.