Logitech G930 Headset

Solution
I have G930 and my ears had no problems with breathing through my nose and I had no problems with having the headset on for long periods of time.
Don't know about yours, but my ears don't breathe. Only my nose and mouth.

You'll get a better answer from someone who has a pair, but closed-back headphones with leatherette cushions don't promise much air movement. Maybe you could get open-cell foam cushions?