The Beautyrest World Class Level 3 Medium Firm Mattress brings together premium triple-strand coil support, advanced cooling foams, and sustainable luxury fabric in a refined 14.5-inch hybrid build.
Cloudy Mattress is an Authorized Simmons Beautyrest retailer, so every purchase is backed by the full manufacturer's warranty. The feel sits firmly on the medium-firm side of the comfort scale, balancing contouring comfort with the responsive support of a premium hybrid coil system.
Because of this versatile response, it ranks among the best 15-inch medium firm mattresses for back pain options for back, side, and stomach sleepers alike. Inside, multiple engineered components work together, starting with an InfiniCool Lux cooling cover that delivers cool-to-the-touch surface comfort.
This Beautyrest Harmony Lux Diamond Series member uses InfiniCool Lux cooling technology with two layers of active cooling at the surface for hot sleepers. Furthermore, the cover features Seaqual sustainable ocean plastic fabric, transforming recovered ocean plastics into high-quality upcycled fibers for an eco-conscious sleep surface.
Beneath the cooling cover, Micro Diamond memory foam is infused with actual diamond particles engineered to conduct heat away from the body. This premium foam layer pairs with SurfaceTouch Gel Memory Foam for immediate, advanced pressure point relief from the moment you lie down.
The mattress also features Beautyrest's Precision Support System powered by T3 Pocketed Coil technology, the brand's premier triple strand coil support design. This premium coil system delivers Beautyrest's highest level of individualized support, ideal for targeted lumbar support and alignment across all sleep positions. Furthermore, the pocketed construction provides motion separation for undisturbed sleep, making this an excellent choice for couples sharing the bed.
RightTemp Memory Foam with highly conductive carbon fibers adds a consistent, supportive feel and additional cooling beneath the comfort layers. Together, these layers deliver deep pressure relief for joint pain alongside a hotel-quality medium firm feel that holds up over time.
At a substantial 14.5-inch profile, this 14.5-inch luxury hybrid mattress is fully adjustable-base compatible and pairs beautifully with modern foundations. Additionally, the mattress is made in the USA, built with CertiPUR-US certified foam, and backed by a 10-year limited manufacturer warranty.
