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, cotton, foam rubber, or a framework of metal springs. [ ] mattresses may also be filled with air [ ] or water. mattresses are usually placed on top of a bed base which may be solid, as in the case of a platform bed , or elastic , such as an upholstered wood and wire box spring or a slatted foundation
north america, mattress makers have begun incorporating gel-infused foams, soft-solid gels layered over foam, and poured gels in the top comfort layer of the bed. [ ] the quilt is the top layer of the mattress. made of light foam or fibers stitched to the underside of the ticking, it provides a soft...
https://en.wikipedia.org/wiki/Mattress