The paper layer absorbs liquids, whilst the impermeable plastic layer prevents any liquids seeping through onto the couch or material below. This specialist couch roll is ideally suited to procedures or treatments where there is a risk of fluids penetrating regular paper only couch roll, contaminating the surface below. This couch roll allows absorption but not penetration. Waterproof 6 rolls per case 1 ply paper, 1 ply polythene. Full 20″/508mm wide rolls 50 metres per roll .