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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Origin of sponge rubber
First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for sponge rubber
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