From Rothy's, The Daily Knit Washable Round Toe Flats feature: Flexible knit upper knit with Rothy's signature thread, which is spun from recycled plastic bottles Slip-on construction Unlined Arch effect insole with ultra-comfortable arch construction Supportive pegged rubber outsole  Machine Washable: Toss in the wash with cold water. Air dry. Wear again and again. Imported.