Petina ballerina is a versatile staple that can easily be dressed up or down. Can be worn on off-duty days as well as on a more stylish night out with friends. Size 39 (size 9). Original price $430. Worn only a few times. I wear 39 in Birkenstock, and this is too small for me. I have wide feet, and if your feet are normal or narrow, they’d be perfect for you!! I usually wear 39 / size 9 and 9.5 for most of my shoes. Please let me know if you have any questions!!