Smith and Nephew Opsite Transparent Adhesive Dressing. This opsite wound dressing is a transparent polyurethane membrane which creates a moist environment by trapping the wound exudate. This is 5.5 X 4- Sold By Box 50/Ea. Smith and Nephew, Inc. a leading manufacturer of wound care supplies. American Diabetes Wholesale carries a wide range of Smith and Nephew, Inc. wound care products, including dressings, cleansers, gels, barriers lotions, and pads. and more, at every day low prices. Please review the size, style, and quantity carefully before ordering.