This QuietWalk Laminate and Hardwood Acoustical Felt Underlayment (Model# QW100B1LT) is in like-new/in-box condition with no damage noted. The roll covers 100 square feet at 3' wide x 33.34' long and is 3mm thick. Designed to reduce sound transmission, provide thermal insulation, and cushion flooring installations. Compatible with laminate and hardwood flooring over concrete or wood subfloors. A simple and effective upgrade for any flooring project.