Ok, it's more than a month since it was last asked ;-)
It's officially the modulus of elasticity, but as the high and low are arse
about face I like to think of it as the modulus of rigidity ie High modulus
has high rigidity, low modulus has low rigidity, ie. is more squidgy.
If you want to accomodate a lot of movement use low modulus, it you want
it harder wearing, use high modulus.
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