Boiled wool made of 100% pure new wool has been used as the upper here. Thanks to the absence of synthetic fibers, the material is warm, soft & breathable at the same time. On top of that, it is slightly pliable to never constrict your feet. The model features a very thick felt sole with a slip-inhibitory latex coating. It serves as footbed at the same time and gently dampers every step. Soles made of felt are particularly low-noise and gentle to any kind of flooring.