We discussed what the conditions were like inside our shoes, that could have led to this transformation and came up with:
* heat
* moisture
* pressure and movement
Next we tried to achieve the same result with cotton wool and with polyester. However after 24 hours or longer inside a shoe, neither the cotton, nor the polyester had felted. There must be something about the wool fibre that causes it to felt ... next step in our inquiry is to magnify a wool fibre and see what we find.
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