SAN ANTONIO — It was once the shoe choice of 1960s hippie types and, much later, the grunge-wearing generation. Now the classic, comfort-over-style Birkenstock sandal is this summer's fashion coup.

Though Birkenstock sandals first gained prominence in the ’60s and ’70s — you can thank the hippies for that — they’ve never been more popular than they are today. Seemingly everyone now owns a pair ...

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Birkenstock, the 250-year-old German brand best known for its flat, orthopedic sandals embraced by hippies and grandparents, is no longer the antithesis of high-fashion. Today, it's a multibillion ...