Hello. I can't comment on the Warrior/Defender boots, but I do have a pair of the Altberg Tetheras. Firstly, they are great boots: hugely comfortable, you almost forget that you're wearing them. I am normally a 9.5, but I had to go up a full size in the Altbergs, so a 10.5. Then you have the 5 width fittings. I have pretty wide feet so I went for the extra wide fit, which is grand. I think that it is important to try these on rather than hoping that they will be ok. If you could manage, a trip to the factory/shop would be an idea, but again if you're along way from Richmond that might not be a