Foil Backed 8mm Foam Sheet for Noise & Heat Insulation (Silver) 1m by 1mThis is sold in running metres and the roll is 1m wide.Specification:Lightweight and slimFlame resistantEasy fit under ply liningAbsorbs minor imperfectionsSubstantial noise reductionSilver aluminium foil vapor control barrierThis product is perfect for the underfloor or walls of campervans, vans & motorhomes underneath ply lining to help with road noise reduction and also heat insulation.