Roberts 70-025 Underlayment Foam, 3/32 in Thick, 100 Sq FtRoberts Unison is an engineered 2-in-1 foam underlayment for laminate and engineered wood flooring. Unison is designed to provide both moisture protection and cushioning as an under-pad on floating floors. Each roll includes a 3 inch overlap with an adhesive strip to seal out moisture at the seams. 48 in width, 25 ft length, polyethylene. An under-pad to support laminate and engineered wood type floating floors; it's 3/32" polyethylene foam increases cushioning between flooring and subfloor; top film protects from harmful moisture vapor; coverage: 100 square feet.