DuoDERM Signal® dressing is an adhesive, tapered edge, modern hydrocolloid wound dressing designed to stay in place with tapered border edges that won't catch, bunch or roll up. DuoDerm Signal® visually indicates when to change the dressing with a dotted indicator line.DuoDerm Signal® contains its own distinctive hydrocolloid formulation which is matchless among other hydrocolloid dressings. The adhesive hydrocolloid matrix and the outer film on DuoDERM Signal® dressing is permeable by moisture vapor and provides an occlusive barrier against bacteria, viruses, dirt and water. Low-profile dressing with smooth, low-friction film backing. Flexible and comfortable. DuoDERM Signal® Dressing is indicated for the management of lightly to moderately exuding wounds. Sterile.