The famous German sandal-makers now produce more than 40 styles of clogs, shoes, flip-flops and sandals. Comfort, simplicity of design and Birkenstock’s environmentally-responsible attitude have all contributed to the world-wide success of the contoured-sole footwear. Birkenstocks are no longer seen as the work shoe for people on their feet all day; their simple, casual look appeals to people in all walks of life.