Hmmm, can't say I've experienced the same. I think the fact that I'm a skinny 69kg guy prevents me from sitting on the portion you describe...
BTW, I was quite surprised to find that the Metro "leather" is in fact Sensatec and not the real cow stuff. After a bit of research though, I'm fine with this, as it seems the synthetic stuff lasts longer, wears better (important when it's white) and wicks moisture better.
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