ECOFIBRA fibrous panels of dimensions 60 cm x 120 cm, highly sound-absorbing and thermally insulating, obtained with the carding process, folding machinery and thermo binding, made from 100% heat-bonded polyester fiber (polyethylene terephthalate), made from recycled PET and virgin COPET, fully recyclable, even in the machining cuttings, Euroclass B-s2, d0 reaction to fire, white, free from dust, resins, additives and binders, insoluble in water, resistant to fungus and bacteria, totally free of hazardous substances. The sound-absorbing panels, placed as cavity panels of dry systems, are essential to achieving the sound insulation of walls, false walls and false ceilings. ECOFIBRA, dust-free, odorless, consists of non-toxic raw material, not dangerous for inhalation or in contact with skin and eyes, it is also used in view as a sound absorbing material in reverberant environments.