Tristan - funny you should post that, I have a same comparison picture between my 8.5's as well. However, I find that the non-shell Barrie LWB's fit snugger than the Shell ones. I'd say pretty drastically so, almost 1/4 (possibly more) in a difference of sizing volume. In any case, it's really too hard to say. My non-shell LWB's all fit spot on, with perfect comfort. The Marlows do feel a little tight, and the Barrie on Shell (both Color 8 and Black) are a bit loose. I could probably go with tongue pads on the shell ones...