Bean bag chairs have retained their basic shape and design throughout the years, the only thing that has drastically been changed since their inception has been the type of material that is used to create them and fill them. The main difference between a bean bag chair that was created back in the early days of bean bag chairs when they were first introduced and a bean bag chair that is manufactured today is the material inside which is no longer as the name would suggest - beans. Instead, these days the main material that is used in the production of these innovative bean bag chairs is polystyrene or a form of small plastic pellets that act as the substitutes for the beans for lower quality bean bag chairs, and high end foam for better quality bean bag chairs. The main cause for the bean bag chairs to be filled with polystyrene and foam is that it is much cheaper in the manufacturing costs and can also be washed easier due to the newer materials being much more wash machine friendly. Since the majority of the bean bag chairs that you can buy in a store are most likely filled with polystyrene or plastic pellets, you can more or less be sure that that's the material that is going to be used within the bean bag chairs. Online however, the best bean bag chairs that are available are filled with new, fresh, springy foam pieces. The size of each of the material inside of the bean bag chair is also a determining factor for how flexible and adaptive the bean bag chairs are going to be once someone sits in them since the bigger the pieces, the less flexible the bean bag chair becomes. An additional benefit to these new materials is that they are better at sustaining when you create a certain form with it, which means you can customize it the way you want it to feel and be relatively sure that it will hold its form unless someone forcibly changes it. Durable, comfortable, fun, this is what you will find in today's incredibly comfortable bean bag chairs. If you are looking for a piece of furniture that is more comfortable than anything you have ever sat in before, check out Ultimate Sack's vast array of different bean bag chairs. Buy an Ultimate Sack today, the most comfortable bean bag chair available.