Wow...not real helpful...Gabriel is all over the place. I wear a US 10.5 and a UK 9.5 in just about everything (EG and G&G) I go UK 9 in Lobb 7000/8000. I have been happy with UK 9.5 in Rain and Inca...definitely roomy width wise. I like the snug fit of my Simpson monk in 9.5. Probably to be safe I should just go 9.5 in all Bonafe? The opening suggestions seem to support this conclusion.