There are many things to consider when looking for a new mattress, it is not a task that should be taken lightly. And the average person will sleep for 229,961 hours in their lifetime, this is one your life, so why should you be uncomfortable during this time.
There are many things to take into account when choosing a mattress, such as what materials it is made out of, as this makes a huge impact on the quality of your nightly rest. For example for older people, their skin is much thinner, due to the fact they have less subcutaneous fat in their body, so they may want a softer surface.
Most mattresses nowadays have memory foam for that extra comfort. A good start is to look for mattresses that carry the seal of CertiPUR, this is a non-profit organization which tests foam mattresses for things such as mercury, lead, and formaldehyde. You must also keep an eye out for the density of the material, it should not go any lower than 3 pounds per cubic foot. If you have a layer that is like 2.8 or 2.5 pounds per cubic foot, it will probably not be as durable and it is more than likely that it will lose its comfort in a few years. You should also never consider buying cheap mattresses on Amazon from China as the density may be 1.5, which is much too low. Now the density of the memory foam does not necessarily dictate how comfortable it is.
Memory foam can also retain heat slightly more than other materials do, so this is why many companies will offer these special coatings or additives which promise to cool things down. Although if you are concerned about this heat, you should look into other types of foam which have more of an open cell structure. To find this out, just press your hand into the foam and then see how long the mattress takes to recover to its original shape once you pull away. The best mattress-inquirerwhich are more likely to have a more open structure are the ones which take 3 to 5 seconds to recover, versus a 10-second recovery.