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Zellerfeld Challenge

Under.Down Zellerflex Mule

Samuel Underdown

Designed after the archival Nike design "City Knife" this mule is designed be folded up and secured using hardware on the toe region and heel pull. Designed to save space when travelling/trekking.

This mule draws its DNA from the Nike City Knife, an archival Nike silhouette originally designed in the late 1990s as a lightweight, low-profile trainer built for urban mobility. The City Knife was notable for its razor-thin sole, stripped-back construction, and a distinctly minimal aesthetic that prioritized packability and ease of movement over bulk — a shoe designed to disappear into city life rather than dominate it.

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