It is important to distinguish between concentric and eccentric compression

CONCENTRIC compression is a general compression of the limb and is achieved by applying a bandage or stocking around the limb.

ECCENTRIC compression is achieved by placing a pad between the bandage/stocking and treated vein. The pad provides an increased direct local compression over a treated vein segment in addition to the general compression provided by the bandage or stocking. Recommended for larger veins.