Birkenstock Lana Leather Medium/Narrow

The Lana is a wedge sandal by Papillo. The sandal features an adjustable heel strap and two front straps for a comfortable fit. 

In Birkenstock a "Narrow" width is more like a women's medium. A "Regular" width is like a women's wide width. They use Euro Sizing. For example a 39 Reg would be like a women's 8-8.5 wide. To figure out your size, add 31 to your shoe size and that will most likely be the size you wear. (31+8=39)