Many years ago, I used to visit a friend who had an old "fold-a-bed". At first when you got into this bed , it felt quite comfortable -- then after a while you started to feel that it had something like a metal bar across the centre of the bed which you could feel (which it did) - by morning your back was broken!!!!! I am having a similar problem with my running shoes now. My "broken foot" is I think getting better , so I am trying to do some walking. But, in that foot, after I put on shoes ( which feel fine when I first put them on) , I get this feeling that somebody has slipped a pencil into the shoe crosswise under the arch of my foot - by 30 minutes, I am in agony. Today I went and bought a cheap pair of mens sandals with 3 adjustable loops - one at the back which controls heel position one at the ankle which locks it to that heel position and one over the toes. The most significant thing about these sandals are that they have an absolutely flat footbed. So far so good - I think it might be time for me to look at ALTRA shoes. Does anybody want 16 pairs of mostly unused shoes???