Silicon Valley goes through its own unique shoe crazes. There were Vibrams. There were Crocs. Now comes the Allbird, a knit wool loafer. In uncomfortable times, Silicon Valley has turned to a comfortable shoe. If there are venture capitalists nearby, they’re probably in Allbirds, too. Google co-founder Larry Page wears Allbirds, according to the shoemaker, as do former Twitter CEO Dick Costolo and venture capitalists Ben Horowitz and Mary Meeker. Founded by a New Zealand soccer star and a clean-technology entrepreneur, Allbirds makes the sneaker-like shoes from wool and castor bean oil.