Product details allbirds looks to vintage sneaker models to create the courier sneakers, made from natural materials for a better future. This throwback style focuses on premium all-day comfort and has a carbon footprint of 4.11 kg co2e, featuring an fsc-certified tencel™ lyocell (eucalyptus tree fiber) upper, a sweetfoam® midsole made with sugarcane-based green eva, and a castor bean oil-based insole foam. Sku: a10798-dgnbnw black fabric lining: fabric lining closure: lace-up fastening toe style: round-toe made in: vietnam fits true to size, take your normal size