An apparatus and method are disclosed. The apparatus includes: a first layer comprising a plurality of openings each having a first open area a further layer spaced apart from the first layer comprising a plurality of further openings each having a further open area and an air impermeable, moisture vapour permeable cover layer over the first and further layers. A region between the first and further layers comprises a portion of a flow path for air and/or wound exudate flowing from a wound site and said first open area is less than said further open area.
