They believe they are quite true to size. I wear 8 in Wolverine's 1000-mile boots (which supposedly run big) and these fit me well but a bit snugger than the Wolverine (my 8 Wolverines can take very heavy socks - these may be a bit too tight with the same socks).
I hope that's helpful.
Wolverine 1000-mile boots. Brown. Size 8 1/2. The boots had thin "Topy" sole protectors fitted ($30 cost). They have been very lightly worn and are in a terrific condition. They will be shipped with original box and Wolverine black buffing cloth. $235 shipped in the CONUS (PayPal "gift" or please add 4%).