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you hit it right on the head. in the 90s and 80s, Nike could have never guessed that people would be attempting to wear sneakers for 20 years.this is the reason they decided to go with polyeurathene: someone spongy but not brittle. in combination with the bigger air bubbles and thick insoles, the older shoes were super comfortable. by 2005 Nike knew people collected their shoes so they started making the midsoles denser to last much longer.Originally Posted by green rhino123
^
well, seems you agree, yet even though the shape of the polyurethane plays a part (AJ4 mold may be the worst),
the most important thing is that the midsoles are made from different polyurethane foams
the old midsoles did flex more - like a sponge - absorbed, expanded & contracted
while one can compare the new closed cell urethane to a rock - letting very little in or out
this is also why paint chipping is more of a problem now, them trying to coat a thick amount
of paint on something that won't absorb any of it
the old kicks were constructed to be an enjoyable wear while the new ones are built to last long
(presumably on some collectors display shelf if you follow me)
(may have never happened this way if yall people would really just wear your stuff, really)