The Allbirds Tree Flyer stacks up well against the Hoka Bondi X, while delivering a level of comfort and versatility that other running shoes lack. When Allbirds arrived in 2016 with simple, comfort-first sneakers that signaled environmental consciousness and coziness, they had a home run. By 2018, the direct-to-consumer footwear brand claimed to have sold more than a million pairs of their sugarcane-soled sneakers.