Geisswein wool slipper / clog with arch support Ulta Comfort Footbed. Navy. Wool slipper expertly felted with 100% wool. Wool is both warm and breathable, possessing natural antibacterial properties. It is also temperature regulating, so our wool clogs keep you warm in winter and cool in summer. The cork midsole guarantees comfort and helps to maintain proper arch support and foot alignment. While the natural rubber outsole provides a great grip and additional support. Giesswein selects only hand-picked wool qualities according to high ethical and ecological standards.