Composite Dressing OxyBand™ 4-1/2 X 5-1/2 Inch SterileOxyBand Wound Dressing is a multi layer wound dressing that comes pre filled with high levels of oxygen between the layers Waterproof top layer provides a barrier to outside contaminants Each dressing comes individually packaged in a sealed pouch Two year shelf life OxyBand Wound Dressing incorporates a barrier layer that holds the oxygen, in the vicinity, of the wound, and a permeable or porous layer that allows oxygen to diffuse into the wound