Upper material: Processed by 100% pure wool felt in the production, this material insulates optimally and is also particularly breathable. Slip in and you won't slip out! Sole & footbed: The thick integrated footbed is made of a cork-latex mixture which is anatomically shaped and cushions your steps. It continues to adapt to your feet as you wear it to provide very comfortable, individualized wear. The profiled rubber sole is slip-resistant and makes them suitable to use outdoors. Great condition, see all pictures for details.