Allbirds' wool runners have been a VC favorite since the beginning. Now, the company is worth $1.4 billion. : The quintessential venture capitalist’s uniform consists of a pair of designer jeans, a Patagonia fleece vest and $95 wool sneakers. The company behind the shoes, Allbirds, entered the unicorn club this morning with the announcement of a $50 million Series C from late-stage players T. Rowe Price, which led the round, Tiger Global and Fidelity Investments. The 3-year-old startup founded by Joey Zwillinger and Tim Brown has raised $75 million to date, including a $17.5 million Series B last year.