Sustainability Matters: Allbirds Delivers a Slip-On Version of Its Tree Dasher Running Shoe + More News FN Staff April 27, 2021: Allbirds released a slip-on shoe bearing the Dasher name today, dubbed the Tree Dasher Relay. The company said the new look comes with all the same performance running features found in the Tree Dasher, but features the ease of the its slip-on Loungers. And, as always, Allbirds delivered the shoe with eco-friendly materials such as one-piece uppers made from eucalyptus trees and dual-density SweetFoam midsoles made with carbon negative green EVA. More from Footwear News April 23, 2021: Kodiak will be the first footwear brand to use