Let it be known that any foam memory mattress you buy should have a good warranty and the company should be willing to replace it if they send you a defective memory foam mattress. It should be able to form to your body exactly as your body is designed. It should be able to contour to every inch of your body. You want to buy a foam memory mattress from a reputable company that has outstanding customer service. It should be a long-lasting mattress that will resist dust mites, bed bugs, mols, and any form of allergens. You should derive no allergic reactions from sleeping on the mattress. Neither should you wake up with pain in the morning. The mattress should be able to absorb independent body motion that should not be transferred to your sleeping partner.