Also known a purl fabric, this knit fabric construction uses purl stitches and regular knit stitches on the same wale to create a rib-effect fabric that is usually thicker than jersey. The simplest form is a 1X1 purl, which incorporates one course of knit stitches and one course of purl stitches on the same wale. The links-and-links knit construction causes the greatest amount of stretch to be in the lengthwise direction.