High density foam is just your typical foam. It does not conform to your body when it heats up like memory foam does.
Instead of purchasing a complete cushion made out of memory foam, it is possible to add one or two memory foam toppers to a regular foam cushion. This will give the support but will not be as hot or as prone to permanent indentations as memory foam.
Memory foam was originally made to improve the safety of aircraft cushions for astronauts.
Memory foam on shoes makes the shoes more comfortable.
Memory foam can be used for a baby mattress. firstname.lastname@example.org
The truthful answers is: "It's the thickness you are willing to pay for". One manufacturer I know of makes memory foam mattresses in three configurations: The top 2" of the mattress is memory foam, the top 4" is memory foam, and the whole mattress is memory foam. The price varies accordingly. Personal Note: If you can't afford a memory foam mattress, try a memory foam pillow. Awesome, especially if you're a "side sleeper".
Many products, such as sleeping mattresses, use Novaform memory foam. The memory foam is also used by various companies that sell pillows and blankets.
Oh yes, there are a great variety of beds. Memory foam is not mandatory.
Many companies offer memory foam mattresses, which may vary in quality. The following guide provides simple tips for finding a high quality memory foam mattress. When looking for a memory foam mattress, look for information on the density of the foam. Lower density foam is often cheap and low quality, while higher density foam provides a more comfortable sleeping experience. A high quality mattress should contain at least 6 inches of high density memory foam, with lighter foam layered on top. When buying a mattress, make sure that the foam is genuine memory foam. Squeeze a sample, and see how long it takes to expand. If the foam expands to it's original shape in less than a second, it's not memory foam.
Tempur-Pedic is a great brand for memory foam mattresses. They offer different sizes, easy financing, pillows, bed linens, travel accessories, and home and office accessories too. Another great brand is The Component Bed Memory Foam. It is a thick layer of memory foam with an additional memory foam topper. Not only does it offer thicker memory foam than most memory foam beds out there, but it also allows you to adjust the firmness with a remote so you can get the comfort you really need.
BedInABox sells some nice memory foam pillows manufactured by PureRest