The invention relates to a knitted spacer fabric with a first planar knitted layer (2), a second planar knitted layer (3) and spacer threads (4) connecting the knitted layer (2, 3), the first knitted layer (2) each having openings (12 ), wherein the second knitted layer (3) has at least a first and a second thread system (13, 15) and wherein the threads of the first thread system (13) run along a production direction (P) on exactly one associated wale and the threads of the second thread system (15) are guided over at least two wales that run in the production direction (P) and are adjacent to one another. According to the invention, the second knitted layer (3) also has openings (12 ') each formed by a plurality of loops
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