Year Introduced: 1986

Onitsuka Tiger lost a lot in the early '70s when Phil Knight and Bill Bowerman - who had tinkered with their earlier running models - split from the company to form Nike. But in the mid-'80s, with the company then known as ASICS, they had an idea of their own. Gel may have been heavier than Air, but liquid was more predictable and had different cushioning properties. Twenty-five years of refinement has just made the original concept look better and better.