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

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-B: Corresponds to a foot length of 26.2 $\text{cm}$ (10.31 $\text{in}$), ball width of 9.9 $\text{cm}$ (3.9 $\text{in}$), acceptable ball width range between 9.6–10.1 $\text{cm}$ (3.78–3.98 $\text{in}$), and fit classification Narrow (9-B / AA).