You can find the type of glue you need at the upholstery shop. They will be able to advise you on how to make the repair you need. It will probably be a good idea to use both a foam glue, and some upholstery tape to hold it together.
Memory foam is made up of a polyurethane foam material with is molded into a form of a mttress, pillow, and so on.
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.
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".
Memory foam on shoes makes the shoes more comfortable.
Memory foam can be used for a baby mattress. anonymous@oola.com
Many products, such as sleeping mattresses, use Novaform memory foam. The memory foam is also used by various companies that sell pillows and blankets.
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.
Oh yes, there are a great variety of beds. Memory foam is not mandatory.
BedInABox sells some nice memory foam pillows manufactured by PureRest
Tempurpedic is a patented trademark name for foam mattresses that offer body temperature regulation. Memory foam is the most generic of these terms, and 'visco' is a specific type of high-grade. dense memory foam.
Amazon.com does indeed sell Memory Foam Mattresses, in a variety of different sizes and prices. The top seller is a 12 inch queen size memory foam matress for $530.