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.Product measurements were taken using size 8, width D - Medium. Please note that measurements may vary by size.Measurements: Weight: 10 oz SKU 9973594