A big feather filled couch.
A lovesac is typically filled with a proprietary blend of shredded foam material. This material provides a comfortable and supportive seating experience.
"The most comfortable salon chairs are the ones that have leather seating to them. Those are comfortable since they are soft, and give your body a chance to relax its back muscles and muscles in the legs."
The frame material doesn't make much difference. The important thing here would be the frame shape and weight, the seating material and shape, what tires are being used, and what, if any, suspension the bike has, as well as what sort of handlebar grips it has.
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For comfortable seating capacity, measure the length of the pew in inches and divide it by 25 for comfortable seating capacity.http://newlifeministries-nlm.org/people/3-13_Crowded.htm
Some alternatives to bean bags for comfortable seating options include floor cushions, poufs, lounge chairs, hammocks, and inflatable chairs.
Hats with elastic and soft material.
Styrofoam . . .
The Sleep Train offers different seating options such as reclining seats, private cabins, and sleeper cars. To ensure a comfortable journey, you can bring a travel pillow and blanket, wear comfortable clothing, and adjust your seat to your liking.
~seating ~menus ~waiter/waitress
If by "friendliest", you mean most comfortable, the Boeing 747 in its Upper Deck Lounge configuration has the widest aisles, most leg room, and most comfortable seating. First class in a 747 is the equal or better of any existing passenger aircraft.
Office furniture seating should be comfortable, especially in a situation where there is a long wait, such as in a busy office or a doctor's office. I would get something that has cushions, at least. A comfortable couch also does the trick.