fibreglass

US fiberglass

/ (ˈfaɪbəˌɡlɑːs) /

noun

material consisting of matted fine glass fibres, used as insulation in buildings, in fireproof fabrics, etc
a fabric woven from this material or a light strong material made by bonding fibreglass with a synthetic resin; used for car bodies, boat hulls, etc
Also called: glass fibre