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Underlay or underlayment[1] generally refers to a thin layer of cushioning made of materials such as sponge rubberfoam, felt, or crumb rubber; this material is laid beneath carpeting to provide comfort underfoot, to reduce wear on the carpet, and to provide insulation against soundmoisture, and heat.[2] In general, it is a layer which is underneath another layer,[2] so underlay is thus also used to describe many different surface-covering products.

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