豆豆 means 'little beans' — the sole has 133 small rubber studs that look like scattered beans. The style was invented by Tod's for driving (the studs grip the pedal). Once you see the sole, the name sticks.
In Pop Culture
Tod's
Tod's
The Italian brand Tod's invented the studded-sole driving loafer (Gommino) in 1978; 豆豆鞋 is now the generic Chinese term for the style regardless of brand.
