Floyd Last: 8.5DUS Men's Brannock: 10D
Funny thing is I own 9 pairs of GS’s and 8 of them are on the Leo last and this is my only pair on the Floyd last. I went 1 full size down from brannock for my Leo lasted boots and these are more roomy so I went with 1.5 sizes down from brannock. They fit like a glove. Awesome!