Memory cotton products have been popular throughout the world for years, always enduring. This is because use memory cotton as filler mattess and pillow has incomparable comfort and care sex, as the world's top brand TEMPUR (tai Poole, also known as the fort's company mentioned, memory cotton mattresses and pillows "are changing human (world) sleep mode". But, as the average consumer, because of little memory cotton feel more mysterious. In fact, the memory cotton just Polyurethane Foam (Polyurethane Foam), is one of the common people say sponge, only in the process of production to join some special additives, such as: modified polyether polyol, open hole agent, special silicone oil, etc. There are many types of polyurethane materials, including hard foam, soft foam, semi rigid foam, since the crust and microporous elastomer, memory cotton just add some special additive has the viscoelastic special soft foam, its base out of the raw material and ordinary sponge materials without too much difference, just add some special additives. So, memory cotton and ordinary sponge difference in where? Memory cotton and ordinary sponge fundamental difference lies in memory cotton both elastic and viscous, namely rebound time, and ordinary sponge only elastic no viscosity, memory cotton and ordinary sponge don't possess the temperature sensing properties, it is these unique physical properties make the memory cotton and ordinary sponge on the function of the difference.