Allbirds Tree Runner - Men's Shoes : Navy Night (white) : Allbirds is a proud Certified B Corporation and sources materials that are FSC-certified. ; Embrace ethereal comfort wearing Allbirds Tree Runner. Crafted from silky eucalyptus fiber, these sneakers offer a cool, breathable experience. Polyester lining and upper, lace-up closure, and cushioned midsole ensure day-long support. ; EVA insole. ; EVA outsole. ; Imported. Measurements: ; Weight: 10 oz ; Product measurements were taken using size 8, width D - Medium. Please note that measurements may vary by size. | Allbirds Tree Runner Men's Shoes Navy Night (white) : 12 D - Medium, Synthetic