FloorComfort 25-ft x 4-ft x 5-mm Premium Foam Flooring Underlayment (100-sq ft /Fan fold) in the Flooring Underlayment department at Lowes.com
QUIETBOARD Rigid Fiber Board 3-ft x 2-ft x 6-mm Premium Felt Flooring Underlayment (90-sq ft / (Panel) in the Flooring Underlayment department at Lowes.com
QUIETBOARD 90 sq. ft. 2 ft. x 3 ft. Premium Acoustical and Insulating Fiber Floor Underlayment with Integrated Moisture Barrier QBOARD23 - The Home Depot