Sylt Flor W Mules & clogs Multicolor available in size 3.5 Women's Birki's Sylt imitation leather sandal with round toe, adjustable strap, gum sole and 2-cm heel. Metallic, glossy, girly and sequined... the Sylt by Birki's features an intricate strap design over the famous anatomical sole invented by Birkenstock.