3M SM400L sound thermal insulation engineered for vehicles. 60" wide, scrim on one side. 1 linear foot is 5 square feet. Material comes compressed from 3M. The material will expand to 1" . Thinsulate is FMVSS 302 certified (federal motor vehicle safety standard). Delivers more acoustic absorption per unit weight vs. competitive products Helps customers meet mass reduction goals Non-woven sound absorbing fibers create a quieter vehicle environment Hydrophobic fibers. Recommend using 3M 90 Adhesive Spray to apply the white fiber side to the Van skin.