Leather like all skin needs Care and does become more supple over time or new shoes would always feel stiff no matter how long you use them..
As it's skin from a cow, leather varies in thickness even after a tannery have done thier work...We could moan to Dan to start using the leather used in Ferrari's or expensive driving gloves..
Body safe leather care products can do some of that work. I can't remember were the recommended products are.
Some artic tribes women spend hours scraping and bitting raindeer skin...
But you won't see Dan chewing on ear pads at RMAF between interview's .. getting the next batch ready...(That's Peters Job)...
You could take the foam out and gently rub with your finger and thumb between the surface touching the ear working the leather.... The foam gives with use.. as our heads are all different...
Probably the most over descriptive leather post on headfi. ...
Or just Email for the recommended care product or Mr Speakers Peters dentist..