Another important feature of a mattress is how thick it is. Mattresses are often classified by thickness in sales catalogues, and the measurements in inches are usually displayed with the title of the product.
There is a range of 8”-12” which is the most common choice for most buyers, but it doesn’t mean this is the best option for anyone. Mattresses thicker than 12” are very rare because past that thickness there is no difference in the sleeper’s experience. The body very rarely sinks so deep a 16” mattress feels different than a 12”.
On the other end of the spectrum, thinner mattresses do exist, especially in small sizes like Twin or Twin XL, because they are usually made for children. There are mattresses as thin as 4”, but these are often called “mattress toppers”, as they are meant to go on top of another mattress to make it softer, cooler and/or more comfortable. You will find memory foam mattress toppers as well as gel mattress toppers.
6” mattresses are common for children, since kids are much lighter than adults, so they sink less. And adult is very likely to find a 6” mattress too thin, regardless of whether or not the bed has a box spring. Since children’s mattresses are changed more often than adult mattresses because they grow up and need a bigger one anyway, a thin mattress is often enough for a young child.
Also, if your child sleeps in a bunk bed, or in a bed with guard rails, then you shouldn’t get a mattress thicker than 8”. Thicker mattresses will be too high and the child will be sleeping too close to the edge of the guard rail. A thinner, 6” mattress will provide more distance between the top of the mattress and the guard rail, helping keep your child safe.
8” and 10” mattresses are very popular among adults, and this range is often ideal for their weight and their size. Many mattresses come in these thicknesses, including most Queen and King sized mattresses which are meant for adults.
If you are particularly big or heavy or want a high-tech mattress with many layers of different properties, perhaps a 12” mattress is the best option. Especially if you are looking for a soft or medium soft mattress, a 12” will sink and receive your weight, allowing you to enjoy a comfortable night of sleep.