When it first appeared in 1997, the FYW S-97 was the first running shoe to utilize adidas’ Feetyouwear technology. This innovative design principle was built on the realisation that square-cut soles were one of the main causes of instability in a shoe, leading to injuries. The solution then was to radically alter the approach to how soles were constructed, creating wider, lower-to-the-ground soles that curved from outsole to midsole. The result was a shoe that featured an utterly unique silhouette, but without resorting to showy technological gimmicks to catch runners’ eyes. The EVA midsole and Adiprene insert further compound the shoes ahead of its time ideas.