There are various parameters to judge the effectiveness of mattresses such as thickness, stiffness, density, foam, odor, heat retention and air flow. All these factors are important for people who suffer from various problems such as backache, neck pain, obesity and any other problem. Many doctors have advised patients to buy memory foam mattresses for daily use. Hence, for a sound and healthy sleep, you should read comments on websites that have memory-foam mattress toppers for the best purchase decision. Memory foam mattresses are generally recommended to prevent neck pain, backache, pain in body and maintenance of body posture.