The Lug Loafer in Onyx Black Soft, premium upper in black knit with a blend of RWS-certified merino wool and recycled plastic bottles. Cushy insoles in beige for added comfort. Rugged black outsoles with lugs on the bottom for extra grip and durability. Chunky 1.5-in (4-cm) heel for added height. Pull tab at the heel makes it easy to slip on your shoes. All of our styles are machine washable—so they last for the long haul. Toss shoes in the wash with cold water. Air dry. No heat, please. As wool is a delicate natural fiber, we suggest using a shoe tree when drying to help preserve their shape.