The mattresses industries have increase in competition in the recent past. The foam based mattresses are making the best in the market. They are very much comfortable to use and retain its sponginess for long time. The foam based mattresses can be of many types but before buying one should look at the compactness of the foam based mattress. If the compactness of the foam is less then at initial stages the sponginess is very high but loses as it used. If the compactness of the foam used in the mattress is very high then it would be very hard to sleep on. The combination of the sponginess should be such that it is neither very hard nor very spongy.
Mattresses manufacturers are also coming up with different foam shape to give the back a better relaxation during sleep. Luxury mattresses come up with quality that helps to take the shape of curved human body. For people who love to through themselves here and there during sleep, cheap kingsize mattresses are also being sold in the market. These mattresses can also be used for more than couple of people to sleep.
Mattresses are after all should give comfortable of sleep without creating any problem in the body.