EPP filler is more expensive. As a lazy sofa, the price of sofa cover and the price of the lazy sofa itself add up to a little expensive. Its filling material is expanded polypropylene, which is more expensive. It can control the free and orderly combination and transformation of internal particles, so that it can deform freely according to people's sitting posture and will not roll into balls. Lazy sofa, also known as lazy bones, soft home, bean bag and bean bag, is a big bag. The outer cover can be canvas, linen, suede, flocking, etc. The inner sleeve is made of non-woven fabric with good air permeability.