STEICO Natural acoustic wood fiber underlayment 2-ft W x 3-ft L x 6 T Premium Cushion Flooring Underlayment (90-sq ft / (Panel) in the Flooring Underlayment department at Lowes.com
Acoustic Underlay for Floating Floors - What is it?
Quick and Easy Acoustic Insulation – Cork Underlay and cork floating Flooring - YouTube
QuietWalk Laminate and Floating Wood Flooring Underlayment with Attached Vapor Barrier- Sound Reduction, Compression Resistant, Moisture Protection 6'Wx60'L Roll (Covers 360 sq. ft) QW360B1LT" - Carpet Underlayments - Amazon.com