Which major athletic footwear innovation was originally inspired by a waffle iron?

The sports industry has seen countless revolutionary products that have changed how athletes perform. From performance footwear to high-tech equipment, product development in sports has a fascinating history of innovation, sometimes arising from unexpected places. Test your knowledge of sports product development with this trivia question about a game-changing athletic innovation!

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Nike's Waffle Trainer sole, created when Bill Bowerman poured rubber into his wife's waffle iron
Adidas Boost technology, developed when a researcher accidentally melted plastic beads in a kitchen appliance
Reebok Pump system, conceptualized when a designer was making Belgian waffles and noticed the air pockets
Under Armour's ClutchFit, developed when founder Kevin Plank pressed mesh material into a waffle pattern