Extremely Dense Panels of Recycled Fiber Board. QuietBoard’s dense, recycled, construction reduces impact noise while increasing floor stability and minimizing flex between planks to make floors solid and comfortable underfoot.\tIntegrated film adds moisture protection and thermal reflective properties\tAcoustical and impact noise barrier\tAdds insulation and energy efficiency\tMakes floors solid & comfortable underfoot\tCloses the gap between trim and floors\tLightweight construction that’s easy to work with & cuts with a utility knife\tProvides enhanced performance for attached pad flooring\tMaintains structural integrity\tMade with 100% recycled materials\tApproved for use with In-Floor Heating Systems\tMade in the USA | Major Brand Underlayment