Knauf R-13 EcoBatt unfaced fiberglass insulation with ECOSE Technology is a leading sustainable insulation. All of our batts are bonded with the revolutionary, industry-transforming, plant-based ECOSE Technology. They are validated by UL Environment as formaldehyde-free, and they contain no Red List chemicals. Made with a high degree of recycled glass, and are pre-cut to install quickly and easily with low dust and low hassle. And like every Knauf Insulation batt, EcoBatt is resilient and recovers quickly to full thickness out of the package for a snug fit. Install Knauf Insulation in your home and stay comfortable-year-round. (Recommended use includes 2x4 steel stud walls along with floor and attic use.).