The Boston clog has spent 50 years proving that an orthopedic silhouette can become a design object. BIRKENSTOCK x ADERERROR marks the anniversary by changing the upper rather than interfering with the anatomical footbed that made the model useful.

Two interpretations follow the collaboration’s “Thread” concept. The Boston Cap adds a second leather layer over the toe, creating a utilitarian shield that makes the familiar rounded shape look more substantial. It comes in black or camel. The Boston Flap extends the upper into an exaggerated panel, then traces its edge with visible white whipstitching. Ultra Blue and Honey colorways make that construction especially legible.

Both styles retain the contoured cork-latex footbed and suede lining associated with the Boston. Zigzag embroidery, layered edges, and ADERERROR’s blue accents provide the visual tension, but the changes remain attached to function: the cap suggests protection, while the flap adjusts coverage and proportion. That restraint matters on a shoe so recognizable that a minor logo swap would feel unnecessary. The result is more directional than the familiar Boston Soft Footbed without treating comfort as an obstacle to design.

BIRKENSTOCK’s 1774 collaboration launched globally August 6 through BIRKENSTOCK 1774, ADERERROR, their stores, and selected retailers. The Boston Flap costs $370 in the United States; the Boston Cap is $395.