5 or 10 in most shoes and based on reviews I went with a 9. Theyre okay for the price. I ordinarily wear a Womens 10 so that is what I ordered. Its a disgrace I think as "everyday carry" headphones, I cant imagine a better deal for the money. So, finally they came and oh boy Im so excited! The protective screen is thinner than on my previous case and some dirt has slipped under, easy to remove but annoying. She wears them everywhere and you can hear her cute little feet patter around the house. Que la plantilla no sea mullida,muy al contrario de lo que pensaba, las hace super cómodas (y lo digo yo, que he calzado varios pares de clarks). The knots in the thread and possibly the type of thread scratches.