Hiya, very interesting thread... I had gait analysis done by my chiropractor a few years ago - the kind of thing were you walk over a mat... I also still had a pair that was done using a plaster cast. I must say the latter is a much better product, still works about 20 years later. The other one was not half as well defined, came back with pretty much the same shape/pattern than the one done by cast, so I would recommend the cast method. Speaking of which, how do Great Outdoors do them? I wouldn't mind a new pair, after 20 years the old insoles are starting to disintegrate...