I purchased a pair of Birkenstock Gizeh sandals online. Size: 37 (24 cm) Regular fit I bought them because I heard they improve posture. I usually wear a size 24.5 shoe, but I tried a 24 and couldn't tell if it was the right size or a little small. I repurchased a size 38 (24.5), and these seem to fit better, so I'm selling the size 37. They've only been tried on.