Introducing the Birkenstock BIRKENSTOCK Zermatt Rivet Slippers. Men's Dark Grey Birkenstock Zermatt Slip-On Mules With Soft Felt Textile Upper Featuring Metal Logo Stud, And Contrasting Tan Contoured Footbed. These Closed-Toe Slippers Have A Textile Insole, And Lightweight Eva Light Grey Sole. Sole Material: Eva Quality Felt Upper Comfort Footbed Textured Sole For Grip Premium Details Throught Birkenstock Narrow Fit Material: Leather.