The Birkenstock Zermatt Shearling FE Womens Clogs in Anthracite are Birkenstock's first true slipper. They feature the iconic cork latex footbed and are fully lined in genuine shearling for warmth. The upper is made of soft genuine wool. The anatomically shaped cork/latex footbed is lined with shearling. Upper material: Wool felt. Footbed lining: Shearling. Sole: Latex. Details: Decorative stitching. Upper material: Wool felt. Insole: Shearling. Footbed material: Cork.