Mid-entry boots came out during a time when I was living in FL and not really staying fully up-to-date on boot technology since I was happy with my Flexons. Lately I've been thinking more and more about what kind of boot design can give you the performance and fit of a race-inspired 2-piece shell with the convenience of a 3-piece shell.
Last Saturday I was booting up in the lodge and the guy next to me was putting on some old mid-entry Salomons. I chatted with him a bit and he let me check out his boots. Many of you may recall that the mid-entry was introduced as a hybrid design between the rear entry boots and standard 2-piece 4-buckle front-entry designs. So they have normal buckles on the instep and forefoot, but the rear spine of the boot is hinged and the buckle system (at least on the Salomon) is almost like a Flexon, but wrapped around the rear of the cuff instead of forward around a tongue.
It looks to me like this design could be made to work - providing ease of entry while still having some of the strong points of a standard 2-piece front entry.
So what happened? Why did they fail?