Finding a supportive backrest is important for upright sitters. Look for models where the sofa frame has a high backrest, rather than just relying on a high back cushion for support.
If you like to curl up or lay down, opt for a lower profile design with a more generous seat depth. Consider arm height too, and choose a lower arm that can double as a headrest when sprawled out.
Sofa cushion construction can affect comfort levels and will be a consideration for vegan shoppers. A pure foam cushion generally offers a fairly firm sitting experience but has the benefit of springing back into shape after being sat on.
Feather and down cushions provide a more squishy seat but tend to settle over time, so require regular plumping.
To combine the best of both worlds, many sofa manufacturers now offer foam cushion cores that are wrapped in a layer of soft feathers – providing comfort whilst retaining the sofa shape.