The BIRKENSTOCK Zermatt is our first true slipper. It features our iconic cork latex footbed, and to keep you extra cozy, it’s fully lined in genuine shearling that will keep your feet warm all winter long. The upper consists of soft genuine wool.. Our model (f) wears the narrow width. Our model (m) wears the regular width. Anatomically shaped cork-latex footbed (Shearling Footbed) Upper: wool felt Footbed lining: shearling Sole: latex Details: clog with extended shaft; decorative stitching; decorative rivet Footbed “Made in Germany”