I adore these Birks! Simply order your size according to the Birk chart and you will be fine. Unless you have super skinny feet and ankles. Then, they may be a bit big on you in width. I have normal size 9 ladies feet and these fit perfectly.  Good quality and so very comfortable. I love that these are a more feminine sandal and can be worn with a dress, shorts, or jeans.  They are quite delicate in comparison with other birks so do not expect super heavy duty.  They hold up well despite their delicate structure however, as I am writing this review after one year.