After a few years of use, your bean bag furniture is going to lose all that comfortable softness as the pellets within it get compressed and flattened. You would then need to purchase refills in order to keep your bean bag sofa or chair in optimum condition. You can choose to buy polystyrene beads which measure about 3 to 9 millimetres in diameter, or micro beads which have a diameter of approximately 1 to 3 millimetres. Generally, the smaller the beads within the bean bag, the more comfortable it will be since it can easily accommodate or adjust to your shape. However, if you want to experience the ultimate in comfort, you can purchase bean bag refills made of shredded polyurethane foam. This can cost you more than the usual bead refills, but the price would be worth it for the extra comfort that you will get from your furniture. Check local furniture stores for the kind of bean bag refills you want.