Simmons BeautySleep Schofield Firm Mattress Set, Full The Simmons 700 Series Wrapped Coil Technology provides exceptional pressure relief and conforming back support High performance; durable foam layers Knit fabrics provide soothing; soft feel for more comfortable sleep Triton Lite Foundation provides strong support Coil Density: Twin-512; Twin XL-546; Full-693; Queen-836; King- 1064; Cal King - 1061