A three-dimensional textile spacer fabric formed of a yarn comprising a blend of gelling fibres and non-gelling fibres, wherein the yarn comprises at least 50% w/w gelling fibres. A wound dressing and composite wound dressing comprising said three-dimensional textile spacer fabric; and a wound dressing for use in negative pressure wound therapy, comprising an occlusive backing layer fitted with a drainage port, and said three-dimensional spacer fabric.