Allbirds Tree Runner - Women's Shoes : Jet Black (White) : Allbirds is a proud Certified B Corporation and sources materials that are FSC-certified. ; Introducing the Allbirds Tree Runner, a fusion of eco-chic and comfort. Crafted from responsibly sourced eucalyptus tree fiber, its silky-smooth polyester upper and lining keep your feet cool. Featuring a lace-up closure, closed toe, and cushioned midsole for all-day support, it's ideal for casual wear, walks, and sunny days. ; EVA insole. ; EVA outsole. ; Imported. Measurements: ; Weight: 7.7 oz ; Product measurements were taken using size 5, width B - Medium. Please note that measurements may vary by size. | Allbirds Tree Runner Women's Shoes Jet Black (White) : 11 B - Medium, Manmade