Made of 100 percent boiled wool which makes the slippers sturdy and breathable. An integrated comfort footbed, which dampens every step pleasantly, prevents wearing fatigue even after ours of wearing. The outsole is an especially thick felt sole which is extremely quiet and floor friendly. It provides further insulation and offers a secure grip on a variety of surfaces due to its grippy latex coating. Get this piece of pure German Gemuetlichkeit to comfort you after a ruff day!