Time for a lesson in Comfort 101! I just love this kind of stuff!
I'm glad you asked. There are three main seat cushion types, and two main back cushion types- both of which have a lot to do with how comfortable the sofa is, and also what type of fabric it’s made of.
With seat cushions, there is low density foam, which is the most affordable, but is known to wear a bit more quickly.
High density foam or memory foam, like my famous Bob-O-Pedic Memory Foam (ahem, not to name drop or anything!), holds its shape for longer and sits firmer.
Down cushions, often seen as the most plush and comfortable, are the most expensive, but do need to be fluffed every couple of weeks and may sometimes cause allergic reactions.
With that being said, hybrid cushions are a great value all around. The best of both worlds, so to speak!
With back cushions, there is the pillow back and tight back. Tight back cushions are sewn onto the frame, so you don’t need to worry about them shifting, but they can be harder to clean and keep their shape. Pillow back cushions are exactly what they sound like- nice, comfy pillows for your back!