Ensleep Formal Mattress

Formal is our fundamentals-first build: a 7-turn, 30% pre-compressed HC pocket-spring core (POSCO high-carbon steel) paired with high-density comfort foams for steady, responsive support and clean motion control. Tuned to the medium-firm feel most sleepers prefer—with Soft and Hard options to match your body and taste—it delivers balanced lift and everyday durability. The skin-close cover uses Belgian 100% viscose fabric certified OEKO-TEX® Standard 100 Class 1; production meets clean-process standards, and the mattress has completed KC safety and radon tests. An upgraded successor to Stable3 with a 10-year quality guarantee, Formal is the textbook mattress—done right.