You would think there was a suitable material they could use for the mid sole that wouldn't break down. In fact I'm sure there would be but I guess it's not in the manufactures interest for their boot to last tooo long.
PS. Those old Mantas I got off you @Sarvo feel bullet proof. I have been wearing them while doing chainsawing/scrub baring and it is like having a pair of small Sherman tanks on your feet.
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