Since Allbirds makes their Women's Wool Runners ($95) from merino sheep's wool, it has paired with leading organisations, such as ZQ Merino, to ensure the wool is held to high standards of farming, land management, and animal welfare. One recycled bottle goes into the making of every pair of laces, Allbirds uses castor bean oil to increase the natural content in its insoles (and reduces their carbon output), and its packageing is made from 90 percent recycled cardboard, too.