a light, spongy rubber, usually prepared by bubbling carbon dioxide through or whipping air into latex, used for padding, insulation, gaskets, etc.; foam rubber.
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How to use sponge rubber in a sentence
He felt the situation was as penetrable as a thick wall of sponge rubber backed by a ten-foot foundation of steel.Cubs of the Wolf | Raymond F. Jones
His gait was a little awkward, in spite of the sponge-rubber floor, because of the huge flowered carpetbag he was carrying.The Foreign Hand Tie | Gordon Randall Garrett
A red rubber or a sponge rubber is much better than an India rubber eraser.Library Bookbinding | Arthur Low Bailey