felts >> fɛlt
Definition: [noun] a kind of cloth made by rolling and pressing wool or another suitable textile accompanied by the application of moisture or heat, which causes the constituent fibres to mat together to create a smooth surface.
Example: a felt hat
Definition: [verb] make into felt; mat together.
Example: the fibres are shredded and felted together
Definition: [verb] cover with felt.
Example: it wasn't long before we had felted the roof making it totally watertight