What's the Problem With the Nike Air Max 90 "Cork"?

Sneakerheads worldwide have been returning their “Cork” Nike Air Max 90s due to a frustrating and loud flaw with the shoe. YouTubers, including the one below, have highlighted a squeaking sound made by the shoes when on feet, caused by the leather sockliner rubbing on the cork tongue. Reviews have warned others to approach with caution and one even branded the drop — part of Nike’s 25th anniversary celebration of the iconic silhouette — an “EPIC FAIL.”