Allbirds Tree Runner Go - Women's Shoes : Medium Grey (Blizzard) : Allbirds is a proud Certified B Corporation and sources materials that are FSC-certified. ; Made to Go with the flow, Allbirds' fan-fave sneaker keeps its signature breathable comfort while hitting the refresh button with elevated style and even more springy support. ; FSC-certified TENCEL Lyocell (eucalyptus tree fiber) upper. ; Shoe laces made from recycled plastic bottles. ; SweetFoam outsole made with sugarcane-based green EVA. ; Machine washable, air dry. ; Imported. Measurements: ; Weight: 8 oz ; Product measurements were taken using size 8, width B - Medium. Please note that measurements may vary by size. | Allbirds Tree Runner Go Women's Shoes Medium Grey (Blizzard) : 5.5 B - Medium