Buying a memory foam mattress is not a minor investment. Some top of the line models can cost anywhere from $2000 to $6000. Because of the growing popularity of memory foam mattress is there are now hundreds of manufacturers and thousands of retailers selling these unique products. Not everyone is high quality (in fact most of them are not high quality). So if you're going to buy a memory foam mattress how are you supposed to know which ones are high quality and which ones are not. You should be able to know the distinction because some companies will charge a lot of money for a mattress even if it isn't high quality.