I tried these on at a store before buying to make sure I ordered the correct size. My feet are a size 9.5-10US, so I tried both the UK7 and UK8. The 7s were very snug and would be more difficult to break in, while the 8s were a bit roomy, even with thick socks. I have narrow feet, and the soles are not too loose. I decided on getting mine in a size UK8. Also, they arrived 2 days before the earliest estimated delivery date. Overall I am very pleased, I only wish these were produced in 1/2 sizes.