The BIRKENSTOCK Zermatt is our first slipper with a removable footbed, allowing you to choose between two different insoles. You can choose from the Standard Classic Footbed, and the Shearling Footbed. The Shearling Footbed insoles can be ordered separately. Perfect for all year round! This basic version of this design features our classic suede lined Footbed. The upper is made from soft wool felt.