Allbirds Earlier this week, popular burger chain Shake Shack and Silicon Valley-favorite shoe brand Allbirds announced they had teamed up to release a sneaker that would be available in New York City for one day only, on May 24. The Shake Shack-inspired sneaker, which created in the style of Allbirds' lightweight Tree Runner shoe, cost $100 to get — but it also involved standing in a monstrously long line on a hot day in Madison Square Park, smack dab in the middle of New York City. And yet, lines formed as early as 5 a.m.