Straight from an OG collector and researcher who actually had the shoes when they came out up till now
I promise you he does not know for a fact that 99s werent real Durabuck he states Nike used their own version. but I clearly remember on Nike.com when I ordered my white cements that they were made from trademarked Durabuck as stated in the description on the Nike website! ive owned ogs and all other retros and I promise you that the 99s were in fact real Durabuck despite info some other collector has posted.