XPS Underlay Insulation 5mm Premium Wood or Laminate Flooring - Like Fibreboard | eBay
FloorComfort 4-ft W x 25-ft L x 5 T Premium Foam Moisture Resistant Flooring Underlayment (100-sq ft / (Fan fold) in the Flooring Underlayment department at Lowes.com
Royale 7mm Sonic Gold Laminate Underlay - Carpet Underlay Shop
Tranquility Ultra 5mm River Walk Oak Waterproof Luxury Vinyl Plank Flooring 6 in. Wide x 48 in. Long | LL Flooring