The Gizeh model is our classic thong sandal. For the "pull-up” design, the high-quality Birko-Flor is treated to create a leather-like surface texture with a slight two-tone effect. This understated summer shoe can be worn to a variety of occasions, with the BIRKENSTOCK footbed supporting the natural rolling motion of the feet. For 1/2 Size order a size up. Size N = Narrow Fit. For reference a Birkenstock Size 40 is Size 9 Women or Size 7 Men.