The upper is made of 100% natural wool felt without any artificial fibers. The absence of synthetics results in slippers that are warm, robust & breathable at the same time. The model features an exchangeable, anatomically shaped footbed that gently cushions every step. It is easily removable by hand within just a second. Therefore, it is also perfectly suitable if you want to use your own, orthopedic insoles. The outer sole is made of lightweight, flexible rubber that allows for natural, unhindered movements of the feet. It has a slip-inhibitory profile that provides the necessary stability on more slippery surfaces.