The thickest of the standard Thermo Liner Pro rolls, the 12mm is the choice for floors and areas where maximum thermal resistance is a priority — particularly in HGV cabs and expedition vehicles that spend time in temperature extremes. The reinforced foil face stands up to wear during installation and keeps its bond to the foam under the rigours of a working build. At 3sq.m per roll it's sized for targeted heavy-duty sections rather than whole-van coverage.