TBL

Through the back loop, or TBL, is a knitting technique where you insert your needle through the rear leg of a stitch instead of the front. This sounds like a minor variation, but it produces a visibly twisted stitch that sits at an angle on the fabric. In flat knitting on needles or in machine knitting, TBL stitches create a tighter, denser column with a characteristic spiral or ribbed appearance running vertically through the work.

The mechanical effect occurs because twisting the stitch rotates the loop through 180 degrees before the new yarn passes through. On a standard stockinette ground, TBL stitches read as a purl-like texture even though you are technically knitting. This makes TBL useful for creating fake ribbing without the yarn consumption of true 1x1 or 2x2 rib, or for adding a decorative textured stripe. Some machine knitters use TBL selectively to tighten edges or prevent curling on garment hems and cuffs.

TBL is less common in industrial flat-bed and circular knitting than in hand knitting, but hand flat machines and small-gauge looms do employ it. The stitch requires deliberate needle manipulation; it cannot happen by accident in automatic production. On hand knitting needles, TBL slows the work noticeably because each stitch demands conscious attention. Tension control becomes harder because the twisted stitch pulls differently than a normal stitch, often causing uneven fabric if the knitter does not compensate with lighter hand pressure.

The main hazard is fabric distortion. If only some stitches in a row go TBL while others do not, the resulting edge looks wonky and the gauge changes mid-fabric. Combining TBL rows with regular stockinette requires test swatches to predict how much tighter the twisted sections will pull. Cold-finished fabrics show TBL texture most clearly, while wet blocking and steam finishing can soften the effect but rarely eliminate it entirely.

TBL sits at the intersection of texture and construction. It is neither a true stitch type nor purely decorative; it is a method for modifying an existing stitch. You will encounter TBL abbreviations in hand knitting patterns as a way to add visual interest and structure without introducing new cast-on, cast-off, or special equipment. In industrial settings, it appears mainly in small-batch or luxury knitwear where custom hand techniques justify the labour cost.