Do it Best loose-fill insulation is a nontoxic natural product made from 85% recycled paper fiber. It is an easy-to-use blow-in insulation for use over existing cellulose, fiberglass, or mineral wool insulation and for uninsulated attic spaces. Creates a seamless thermal blanket by filling gaps and voids, which reduces air infiltration. Fast and easy-to-install. You can achieve any R-value from R13 to R60. 2 to 3 times more dense than fiberglass batt insulation, helping to keep your home warm in the winter and cool in the summer. Additionally, this density also provides effective noise reduction within your home. Low dust formula and no-itch.