Memory foam mattresses have taken the world by storm since their introduction and for good reason: They give you a better night’s sleep than regular mattresses and are perfect for people with chronic back problems. However, how much do you really know about them? Who invented memory foam? What memory foam mattresses are the best for you?

First things first: what exactly is memory foam? It is polyurethane that has certain chemicals added to increase its density and viscosity. It is commonly known as “memory polyurethane foam”. It is well known that it adapts to your body, but did you know that it is the heat of our bodies that makes it change?

It was developed in 1966 under a contract with NASA, curiously to improve airplane cushions. One of the major contributors to the contract (Charles A. Yost of Stencel Aero Engineering Corporation) later founded Dynamic Systems Inc. with NASA to commercialize the breakthrough, and the foam was quickly incorporated into a wide variety of products, from tabletop protectors to lightning X up to helmet liners.

Now, after that brief history of memory foam, what should you look for when shopping for a foam mattress? Right off the bat, you should know that there are a few things to know about memory foam mattresses. The comfort measure of a memory foam mattress is determined on a scale of firmness, from hard to soft. The measurement is called the Indentation Force Deflection Index (IFD) and most mattresses are in the 12 to 16 IFD (firm) range.

Now, because they are so dense, foam mattresses are less prone to dust mites and mold, which is a huge plus for people with asthma. Memory foam has what is often called an open cell structure. Therefore, it has the ability to react to body heat and mold itself to your body. This allows it to help relieve pressure points and is particularly helpful in preventing pressure sores.

Another interesting point to consider is that many people have found that the mattress’s natural ability to retain heat (that’s how it holds its new shape) helps them if they have ailments such as arthritis and joint pain. If you have neck problems that a hot water bottle fixes, then a memory foam mattress could help you in your quest for a better night’s sleep.

The memory foam mattress has become extremely popular in recent years and for excellent reason. They give you a better night’s sleep and help with a variety of other sleep (and bed) related concerns. Sure it may cost a little more, but can you put a price on your daily rest?