Remember Birkenstocks, those clunky but comfy sandal-shoes so ubiquitous in the '70s? Their time has come again. Updated with slightly sleeker styling and trendy materials like black patent leather, the shoes have increased in sales 30% during each of the past three years. This year Birkenstock Footprint Sandals expects a 40% increase, to about 1.4 million pairs. They are still made with layers of suede, jute and cork, with the sole contoured to the natural shape of the foot and a shock-absorbent foot bed. Prices range from $50 to $130 for adult sizes.
Birkenstocks were introduced to the U.S. after Californian...