That's what was awesome about the Air Max 98 TL's. They used a Phlylon midsole with the air units, so they were not susceptible to crumbling. Just separation and air leakage. The GS versions of the 98 TL's used the air max 97 midsole which was polyurethane so of course those would crumble now. Im waiting for a retro of the 98 TL's. One of my Favorite Air Maxes of all time. The white/Blue/Neon was the pair I had multiple times and wore them to the ground. I have a feeling if they do retro, they will end up using the 97 midsole which I am not fond of.