ROCKWOOL COMFORTBATT is a stone wool insulation product that can reduce noise and sound absorption in residential wood and steel stud construction. Better fit, flexible edge compensates for normal frame variability, cuts easily. User friendly, no fiberglass in product. Easier and faster to install. Water-resistant, non-combustible and fire-resistant. GREENGUARD certified. Does not promote growth of fungi or mildew. No sag over the years.