SuperFelt: Made from 80% recycled fibers, provides deep, rich sound by absorbing sound. Extremely high temp manufacturing process treats fibers. Excellent for radiant heat floors. Mold & mildew resistandt. 3mm pad corrects minor subfloor imperfections. 2 mil thick top film protects from harmful moisture vapor. Added R-Value to chilly floors. Includes adhesive strip and 3" overlap film. For use under laminate and engineered hardwood floors. 44" x 27.3'. 100 sq ft/roll. 1/case, 36 cases/pallet.