Which innovative cushioning technology, first introduced in 1979 and visible through a window in the midsole, revolutionized running shoes and became Nike's most successful product innovation?

The sports footwear industry is constantly evolving with technological advancements and innovative materials. Major brands invest millions in R&D to create products that enhance athlete performance while establishing unique brand identities. This trivia question focuses on a groundbreaking product design that revolutionized the athletic footwear market and created a billion-dollar product line. Test your knowledge of sports product design history!

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Nike Air
Reebok Pump
Adidas Boost
ASICS GEL