The uppers are made of real leather. then letting it release naturally and let it sit (not on keep warm) for a couple of hours. Such a good quality. Potrei tenerle per ore (cosa che faccio) senza problemi. I purchased these for my son to replace a pair that he had literally worn out. Do it slowly so you don’t strip the bolt or break the end piece. No sanding was needed at all. Bass is tight and well-balanced, but not overwhelming (those who want enhanced bass should probably look elsewhere). it was great and snug at the beginning, I thought it was great and better than the other one I have, but only 2-3 months later, the top keeps coming loose, wont stay on. Most of you probably dont remember girdles.