Smith & Nephew Acticoat™ Flex 7 Antimicrobial Barrier Dressing with Silcryst Nanocrystals 2" x 2" Square, Highly Flexible, Low Adherent Smith & Nephew Opsite® Transparent Adhesive Dressing is a moisture vapor permeable, conformable and extensible dressing. It is widely used to provide a moist wound environment for superficial wounds and is also ideal for use as a secondary dressing.