Birkenstock gizeh sandals in an adorable 'blue lagoon' shade. Isn't this a colour everyone needs in their wardrobe for the summer season? There isn't possibly a more versatile sandal than the thong, a style that looks great with any outfit. These gizeh features an adjustable strap, a footbed that moulds to your feet (comfy!) and the sole does a great job at absorbing shock.