Spacer fabric

A composite spacer fabric comprises:

• a first flat warp-knitted fabric layer having openings each formed by a respective plurality of stitches;
• a second flat warp-knitted fabric layer also having openings that are each formed by a respective plurality of stitches, the second warp-knitted fabric layer further having
• a first yarn system with yarns running in a production direction over exactly one respective stitch wale;
• and
• a second yarn system with yarns extending over at least two adjacent stitch wales that run in the production direction,
• the openings of the fabric layers being larger than one of the stitches or the space between two of the stitches,
• the second yarn system being formed as a filet knit or net structure having a first partial yarn system and a complementary second partial yarn system, and
• stretch of the composite spacer fabric as determined in accordance with DIN EN ISO 13934-1 at a tension of 25 N in the first flat warp-knitted fabric layer being between 25% and 60% in the production direction and a transverse direction that is transverse to the production direction, stretch of the composite spacer fabric also determined in accordance with DIN EN ISO 13934-1 at a tension of 25 N in the second flat warp-knitted fabric layer being between 1.5% and 10% in the production transverse directions;
• and
• spacer yarns interconnecting the warp-knitted fabric layers.