Dekorman Laminate Flooring Blue Foam Underlayment 3.6 ft W x 27.9 ft L x 2 mm T (100 sq.ft/roll) 2BF1 - The Home Depot
Project Source 3.34-ft W x 30-ft L x 2 T Standard Foam Moisture Resistant Flooring Underlayment (100-sq ft / (Roll) in the Flooring Underlayment department at Lowes.com