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The Foamex® 4 lb. 8" memory foam mattress is a fantastic price leader and should be price competitive with just about any other quality memory foam bed on the market. Because of the 2 inch 4lb. layer of Foamex® memory foam on top, it is also a great configuration for those individuals who are looking for a medium firm bed.
Features of The Foamex® 4 lb. 8"
This RMM mattress is eight inches thick and includes two 3 inch layers of high-density Reflex foam in the core. One layer is rated at 30 ILD (Medium Firm) and the other at 35 ILD (Firm). On top of the core is a 2 inch layer of 4 lb. viscoelastic memory foam.
Free Upgrade! All of our do-it-yourself component beds now come with a luxurious CoolMax® by DuPont® mattress cover for cool, moisture-free sleep.

Component Mattress
This Rocky Mountain Mattress is a "component mattress", meaning the layers are not laminated together like a traditional mattress but held together by friction and the zippered cover. This allows more flexiblity in changing the feel of the bed by changing the order and densities of foam layers.
Rocky Mountain Mattresses do a superior job of relieving pressure that can cause discomfort and interrupt sleep. When compared to nationally branded, market leading premium viscoelastic foam beds, our component mattresses offers you interchangeable support and comfort layers where other beds cannot be adjusted because the layers are all laminated together.
The core of the mattress is made up of two support layers, using a premium, high-density foam made through the state-of-the-art VPFsm technology, providing superior support characteristics when compared to inner springs, with the added dimension of enhanced comfort.
Each of the two core layers in the mattress are rated with different ILD's (firmness rating), one at 35 ILD (more firm), and one at 30 ILD (less firm). This allows the sleeper to customize the feel of the mattress by choosing which layer they would like closer to the sleeping surface, the firm layer or the softer layer.
This RMM mattress uses ultra high quality domestic viscoelastic memory foam by Foamex®. Foamex® visco outperforms existing viscoelastic products in consistency, quality, and shape-conforming comfort.
Foamex® visco is fluidly responsive to a broad range of temperatures. The result is a smoother, more gradual shift in firmness that allows sleepers to change position without hitting an uncomfortable barrier of hard, non-responsive foam. The fine memory foam cells give it a softer, more luxurious feel than competitive products. Foamex® visco has a long "memory." As a result, Rocky Mountain Mattress beds do a superior job of relieving pressure that can cause discomfort and interrupt sleep. When compared to nationally branded, market leading premium viscoelastic foam, RMM beds reduce pressure to the head, scapular, sacral, and heel regions by up to 15 percent.
Rocky Mountain Mattress mattresses using domestic high quality Foamex® memory foam provide superior comfort while virtually eliminating permanent body impressions. Even after tests simulating many years of use, this mattress maintains its feel, retaining 95 percent of its original IFD rating. The mattress retains its viscoelastic properties far longer than non domestic conventional viscoelastic.
Mattress Foundation
No special foundation is necessary with the mattress - any firm flat surface will work. If you find your box spring is too soft, simply lay a piece of plywood between the box spring and the mattress to provide a firmer foundation surface.
For additional Memory Foam Information including care and safety click on the link.