Good used condition The Flat in Black Solid Soft, flexible upper in black. Comfortable insoles and durable outsoles in black. Washing instruction All of our styles are machine washable—so they last for the long haul. Slip out insoles. Toss insoles and shoes in the wash with cold water. Air dry. No heat, please. Wear again and again. Knit from Rothy’s signature thread, which is spun from plastic bottles. It took about 11 plastic bottles to knit this pair of shoes. In 2023, Rothy’s factory achieved TRUE Platinum certification, validating that it’s operating with Zero Waste Practices by diverting solid waste from landfill, incineration and the environment.