Set your budget and keep cost in mind as you pick out a memory foam mattress. This type of mattress is more expensive than standard mattresses. You need to stick to your budget, but expect to pay at least $1,000 for your memory foam mattress.
Test the firmness. Memory foam mattresses have different levels of firmness like standard mattresses. What you choose depends a lot on your personal preference. Generally, a firm mattress works well if you sleep on your back, and a softer mattress works well if you sleep on your stomach. A medium firmness level is appropriate for people who sleep on their side.
Find out what the density level is for the different layers of foam. Higher quality memory foam mattresses will have multiple, dense layers of foam manufactured by reputable companies. Pick a memory foam mattress with a density of at least 3 inches per layer. The heavier you are, the more dense your foam layers should be.
Research the manufacturer of the memory foam mattresses you're considering. You can look at their website to get an idea of their reputation and years in business. Also, contact the Better Business Bureau to make sure the company is accredited and to find out what types of complaints have been filed and if they were resolved.
Get a warranty and money-back guarantee, if possible. The warranty should last for at least a few years. They money-back guarantee is important because you want to be able to test out the memory foam mattress for several nights to make sure it's the right choice for you.