Because memory foam reacts differently to different temperatures and body weights, you won't truly know if it works for you until you sleep on it for a few weeks. Look for a brand that offers at least a and a 10-year warranty that specifically covers "sagging" or permanent indentations.
Usually need a softer feel to cushion shoulders and hips. what to know when buying a memory foam mattress
Generally cheaper and softer, but may sag sooner. but may sag sooner.