OPSITE POST OP DRESSING 15.5cmx8.5cm (PAD12cmx3.7cm) OpSite Post-Op is a revolutionary post-operative dressing combining a high Moisture Vapour Transmission Rate (MVTR) film and the cushioning and absorbency of a low adherent pad together with an easy application carrier system. The hydrophilic polyurethane film on OpSite Post-Op has REACTIC* properties that switch on in the presence of moisture allowing any excess to transpire into the atmosphere.