foam rubber

a light, spongy rubber, used for mattresses, cushions, etc.

1940–45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica

foam rubber

flexible, porous substance made from a natural or synthetic latex compounded with various ingredients and whipped into a froth. The resulting product contains roughly 85 percent air and 15 percent rubber and can be molded and vulcanized. Its uses include padding for furniture, mattresses, and pillows. In special processes, a blowing agent is incorporated into the latex to liberate gas during vulcanization, forming small closed cells; the resulting foam is nonabsorbent and useful for thermal insulation, as in refrigerators. Molded into sheets, it is used in gaskets, weather stripping, and vibration-damping materials

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Molded plastic handles are made more comfortable with foam rubber grips.
Use thick foam rubber for bench cushions and mattresses and use fabrics and
  flooring that are easy to keep clean.
Those three pieces of foam rubber that have been hung from the hog house are
Many vendors will not accept foam rubber or latex foam.
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