The TrafficMaster Moisture Barrier Underlayment is a 6mil thick roll of flooring underlayment designed to protect floors from moisture and improve overall performance. Made from durable polyethylene material, this underlayment is 200 sq. ft. in size, with dimensions of 20 ft. in length and 120 inches in width. The black color of the underlayment adds a sleek and professional look to any room, making it an ideal choice for home improvement projects involving flooring installation.