check out the salomon impact 8cs they are a 100flex i believe, and them as well as the impact 10cs's have a custom shell, hence the CS. What they did was used kaprolene(sp?) its a rubberish material used in prostedics and u can actually stretch out the width of the shell to ur foot. What u do is get the boot, take out the liner most shops who sell these boots have a convection oven, the liners come out, and the entire shell goes in the oven for about 5-10 minutes. Once thats done, the buyer puts on the liner, the bootfitter holds open the top of the shell (its as soft as butter) and u slide ur foot in, u sit in a flexed position for about 10 minutes, the kaprolene will then mold around the width of ur foot, making a complete custom shell fit for ur foot. The forefoot of the boot is already a bit wider so it helps fit wider foots, the heel pocket is a bit on the narrow side, but thats a nice fit to hold ur heel in place. Salomon boots i feel fit pretty true to size, but rememer they will pack out 1/4 of a size. if u have anymore questions just respond here, or pm me.