Johns Manville ComfortTherm poly-encapsulated thermal and acoustical fiber glass insulation is lightweight and made of long, resilient glass fibers bonded with an acrylic thermosetting binder. ComfortTherm is wrapped in plastic for more comfortable installation with less itch and dust. The product is available with a vapor-retarder plastic facing, and also with a plastic facing that does not act as a vapor-retarder, for use in hot, humid climates. Pre-cut batts fit standard wall cavities and are faster to install than roll products.