Contains a semi-permeable hypoallergenic polyurethane polyacrylate top layer, and a hypoallergenic, polyacrylate adhesive layer. Rounded corners reduce potential roll-up and extend wear time. Conforms well to body contours. Highly breathable film reduces maceration risk. Waterproof. Sterile. 4 x 6 inches. There are 50 transparent film dressings in a box.