Dynamat Dynaliner Sheet is a single 1/4" thick sheet that measures 32" x 54" and covers 12 square feet. Dynaliner is a lightweight insulator to use on top of Dynamat Xtreme. This durable, crush and tear resistant material has the highest heat blocking properties available in a single layer material. Dynaliner isn't affected by oil and does not absorb water. Dynaliner provides acoustic isolation and excellent thermal insulation for roof, firewall, floor, quarter panels, doors and even under your hood.For a tech article on this item, please visit HERE.