Im sure this has been a topic before but I thought id share. Im a big guy pushing 300lbs and I struggled finding a cushion I was comfortable with. I can sit on all cushions for about an 30-45 min but then begin to get uncomfortable. When the birds are doing right it don't bother me but as everyone knows its a rare occasion and sometimes you got sit for awhile.
I have found the air doughnut seat is by far the best seat I have found. I have bought one from Breedlove air cushions and have been using for couple years now. It just a inflatable tire tube in sewn in pouch. Only downfall is that it can puncture.
I don't work for them or trying to sell them, just thought Id share what has worked for me. Nothing worse than always being uncomfortable.