QuietSound 60 sq. ft. 15 ft. x 4 ft. x .394 in. Premium Acoustic Underlayment for Tile, Laminate, Floated or Glue-Down Wood Floors 0210999 - The Home Depot
Acoustic carpet underlays for office flooring | Tarkett
QuietWalk Sound Absorption and Vapor Barrier 60-ft x 6-ft x 3-mm Premium Felt Flooring Underlayment (360-sq ft /Roll) in the Flooring Underlayment department at Lowes.com