Williampen

Pick up seat cushions when buying furniture. Quality cushions should be heavy.
A sofa with heavy cushions should be more expensive but you will not have to replace the cushions anytime soon.

Wood furniture is perhaps the most popular kind of furniture.
If you decide to by anything wood, however, there are some things to look for in order to ensure you are getting good quality. Run your hand over the furniture and make sure it is smooth.