From Twisted X, the Women's ecoTWX® Slip-On Driving Mocs feature: Genuine full-grain leather and ecoTWX® upper. ecoTWX® is a durable, eco-friendly material made from recycled water bottles Moc toe construction Removable, moisture-wicking, antibacterial, and machine washable SD footbed Slip on design Composite XD insole provides unrivaled support and stability Slip-resistant molded rubber outsole for added durability and improved traction Flat heel Imported. Every shoe in the ecoTWX® line is created with 13 plastic bottles and, for every pair sold, Twisted X® will plant one tree in the United States through the organization OneTreePlanted.org.