The Allevyn non-adhesive dressing's absorbent hydrocellular pad, contact layer and breathable top film keeps skin moist It creates an environment conducive to healing to help wounds get better faster The outer polyurethane top film is breathable and acts as a barrier to bacteria to prevent infections This Allevyn Classic dressing has a highly absorbent hydrocellular foam core that wicks away fluids It won't stick to the wound and reopen it to ensure proper healing 10.5 x 10.5 centimeters