Sizing on the Thursday boot Captain Boots is 11.5 D. I usually wear US 11 D or E for North American boots and UK 10.5 or UK 11 for British shoes and boots.
On their website, it is advised take the boots size half a size down from your sneaker size.
That is simply not true.
I normally wear US12 with Nike, and they fit perfect. Of course with some models they fit more tight.
11.5 D on Thursday boot captain boots fit great with the heel, vamp and the flex point. However, they are too long. There is a lot of space in front of my big toes.
Did not get the chance to try 11 E, but I would think that 11 E would fit so much better for my feet.