Promotes moisture evaporation and improved securement while providing continuous site observation. Provides a waterproof, sterile barrier to external contaminants including liquids, bacteria and viruses. In vitro testing shows that the transparent film provides a viral barrier from viruses 27 nm in diameter or larger while the dressing remains intact without leakage. Picture-frame delivery makes placement accurate and easy, minimizing potential to stick to gloves or to itself. 3M Tegaderm Diamond Pattern Film Dressing. A transparent dressing for protecting I.V. and wound sites and securing catheters to moist skin. It balances increased breathability with effective adhesion so it stays in place even in moist conditions.