Triangular bandages can be used as large dressings, as slings to support a limb, or to secure a dressing in place. If you're using a triangular bandage as a sling on an arm, you use it opened out. You should: ask the person to hold their arm across their chest and support the arm while you work put the bandage under the arm and around the back of the neck put the other half of the bandage over the arm to meet at the shoulder and tie into a knot tuck the loose ends of the bandage in at the elbow, or use a pin If you're using a triangular bandage to support a lower limb or large dressing, fold it in half horizontally so the point of the triangle touches the middle of the long edge. Then fold it in half again in the same direction to make a broad strip.