Eco-friendly footwear brand Allbirds and popular burger chain Shake Shack are dropping a one day limited-edition collaboration today at Madison Square Park in New York City.

The Allbirds x Shake Shack Tree Runner Shoes will be available at Shake Shack’s original joint in the park with a burger and the vanilla and toffee Hokey pokey shake, which was exclusively created for the occasion. Like all Allbirds styles, the exclusive collaboration is made from sustainably harvested eucalyptus trees and comes in Shake Shack’s signature green and white colours with the famous chain’s burger joint logo on the unisex shoe’s tongue.

Inspired by the nature of New Zealand and its rich resources, Allbirds quickly gained a cult following for its new approach to shoemaking. The brand’s lightweight sneakers are entirely made of natural and sustainable materials and claims to make the “world’s most comfortable shoes.” After launching may successful pop-ups around the US, this is Allbirds’ first high-profile collaboration and given the hype around it, we can expect many more.