8 Best Soft Mattresses (2026): Plush 3–5 Firmness, Engineer-Tested
8 soft mattresses lab-measured 3–5 firmness. Pressure-mapped for side sleepers and lightweight bodies. 30-night trials inside.
Our editors evaluated dozens of options to assemble this soft shortlist. Each pick is hands-on tested in our Encinitas, California sleep lab and ranked against measured criteria — not vendor marketing.
What you'll find on this page about soft: lab-measured scores, hands-on testing notes, our recommended buyer profile, current pricing intelligence, and a clear verdict from the Sleep Sage editorial team. Page last reviewed August 2026.
8 soft mattresses lab-measured 3–5 firmness. Pressure-mapped for side sleepers and lightweight bodies. 30-night trials inside.