US: 10-4E to United Kingdom Size 8-AA

US: 10-4E: Corresponds to a foot length of 28.5 $\text{cm}$ (11.22 $\text{in}$), ball width of 11.6 $\text{cm}$ (4.55 $\text{in}$), acceptable ball width range between 11.3–12 $\text{cm}$ (4.45–4.7 $\text{in}$), and fit classification Extra-Wide (10-4E / EEEE).

United Kingdom Size 8-AA: Corresponds to a foot length of 25.2 $\text{cm}$ (9.92 $\text{in}$), ball width of 9.3 $\text{cm}$ (3.66 $\text{in}$), acceptable ball width range between 9.1–9.5 $\text{cm}$ (3.58–3.74 $\text{in}$), and fit classification Extra Narrow (9-3A / AAAA).