Wiktionary
n. 1 Expanded latex. 2 (context informal English) Expanded polyurethane, the padding often used in cars and furniture.
WordNet
n. spongy rubber; made by introducing air bubbles before vulcanization
Wikipedia
Foam rubber (also known as cellular, sponge, or expanded rubber) refers to rubber that has been manufactured with a foaming agent to create an air-filled matrix structure. Commercial foam rubbers are generally made of either polyurethane or natural latex. Latex foam rubber, used in mattresses, is well known for its endurance.
Usage examples of "foam rubber".
There were enough crossbows for practice, and shields with foam rubber bound around their rims, spears with blunt cloth-bound tips, extra-weight wooden short swords.
In this clip, Vishniak was wearing a tremendously oversized, bright yellow foam rubber hand over his real hand.
If you work your way in far enough, you will find a girl, or sometimes two, lying on a riser carpeted in foam rubber.
The only limiting factor was the coldness of the water which affected us after a time, even though we were using our heaviest foam rubber suits.
When Phil hurried back lugging the foot-high cylinder of foam rubber, a doorway about as big as a midget was open in the cylinder.
Stripping to the skin, Tommy climbed into the foam rubber diving suit he had rented from Don Duckett's Diver's Den the day before.
He cut, with a complicated pocketknife, another section of foam rubber.
Moments later he found himself in a dark recess surrounded by plastic tatters and foam rubber.