Birkenstock | Shoes | Mens Birkenstock Callan In Navy | Poshmark。Birkenstock Callan, a versatile slip-on shoe crafted from soft navy blue suede leather. This style combines casual appeal with the signature anatomically shaped cork-latex footbed that molds to your feet for custom, all-day comfort and support. The minimalist design features elastic side panels for easy on and off and a collapsible heel that allows them to be worn as both a shoe and a clog. They are grounded by a natural rubber sole for added traction. Size: 44 Excellent condition Offers Welcome!