Allbirds Men's Wool Runners | size 12CLASSICS:Natural Grey (Light Grey Sole)Wool Runner HighlightsWarm and cozy ZQ Merino wool provides next-level comfortCushioned midsole gives wear-all-day supportMachine-washable materials keep shoes looking like newSustainable Materials:ZQ certified Merino wool upper that meets the highest standards of animal welfare, environmental care, and social sustainabilitySweetFoam® midsole made with sugarcane-based green EVAShoe laces made from recycled plastic bottlesCastor bean oil-based insole foamZQ merino wool heel lining