Second Skin OverKill Pro Closed Cell Sound Insulation Foam for Cars - Water Resistant - 3/8" Thick, 9 Square Ft. Sheet - Made in the USA Odorless and flexible  inch thick vinyl infused closed cell rubber foam specifically engineered to absorb airborne noise ranging in frequencies of 15k Hz - 20k Hz. Excellent for use on automobile door skins, floors, ceilings, trunks, and in between rattling panels. Water resistant - Ideal for use in wet areas inside of vehicles. Heat Resistance up to 165 Degrees F and must be 2" from heat source. Wont melt easily like other cheap foams on the market. Proudly Made in the USA.