Hopefully this adds some additional insight and not confusion, 2030 shell marked half size larger than 310. Length feels about the same, much more room across the toes and vamp with the 310. My 2030 is a half size larger rather than the 310 being a half size smaller if that make sense. The 2030 isnt a great fit for my high instep wide foot : These are same marked size between the two. I find the unlined shell to fit/feel just about the same as the lined above.