This style runs true to size. I have a friend who normally wears US 7.5B boots, and the 7.5B 1626s fit her quite well. 


These will fit someone who normally wears women's 10D boots, and possibly someone who normally wears 10B, or 9.5D boots after replacing the provided footbeds with a thicker alternative.


If these boots will be used for work in a company that helps cover the cost of footwear, let me know before buying so I'll ensure you'll receive a proper invoice that can be shown to your employer.