Felt laid under a carpet to add thickness and reduce wear.
Example sentencesExamples
Again, don't splash water inside the car because soaked underfelts can take ages to dry out.
We recommend the use of new underfelt when installing new carpets to ensure a smooth finish.
Carpets and underfelts might be rubber or foam-backed and/or treated with chemicals such as pesticides.
While the slates are off, the roof space will be insulated, a fire barrier will be installed and the new slates will be put back over underfelt to improve the waterproofing.
Foam or rubber underfelts are the most common and both come in a range of qualities.
Jeremy (the person who came to deliver the carpet) went back to fetch underfelt but was about 40 cm too small on each side.