WHAT IS A LOVESAC? Our sacs are not filled with polystyrene beans, but instead are filled with a polyurethane foam - hence they are not 'Bean Bags'. Lovesac is not only an evolution, it's a revolution. We are the ultimate in alternative furniture. You will not find another item with the same properties of the same quality. When you want the next best thing, remember second place is the first loser! Accept no substitutes.