I am currently on the phone with these headphones for several hours at a time ( #homeoffice #corona ). No annoying heat development; after several hours I notice the headphones. But I've never had such good headphones before.... only loudspeakers (i.e. without headphones) are more pleasant :) . Maybe there are even better ones, but I am fully satisfied.

I had the same concern. The headset is surprisingly comfortable. The ears do not get warm compared to my previous headset of similar design and it remains very comfortable.

Same for me, currently home office and online meetings, no problem, comfort and heat development ok, also recommended for spectacle wearers :-)