There are two ways in which I prolong the use of my woodland centre seam moccasins. One is to sew extra soles on the moccasins, and the other is to carry inner soles in my pack. I also carry spare moccasins tied to my blanket roll.
The leather inner soles I carry are not a permanent repair, but if you have a whole right through the moccasin sole. these will protect your feet until you can make a better repair.