Fabric is used as a barrier in beds and drainage trenches.  It is sold per linear foot.

Varieties:

Driveway / landscape 12 x 250′
Landscape Cloth 3′ x 250
Landscape Cloth 4′ x 250
Landscape Cloth 6′ x 250

Road Fabric Ribco 12.5 x 360 - used as a barrier between the sub base and driveway material.

EPDM Fabric .045 10′ x 50′ - used as a barrier to deflect water along your foundation