Scientific and clinical studies consistently suggest that while "ultra-soft" mattresses provide the most pressure relief, they are often linked to lower sleep quality and spinal misalignment for the average person. Clinical research from the National Institutes of Health (PMC) indicates that soft mattresses (rated around 32.6 HA on a hardness scale) are associated with longer sleep latency (time to fall asleep) and more frequent sleep stage transitions compared to medium-firm options. Softest Mattress Models on the Market

According to current expert testing for 2026, the following models are identified as the softest available options: 8 Best Soft Mattresses of 2026: Reviewed by Sleep Experts