Cutaway stabilizer.

Cutaway stabilizer is backing hooped under the fabric, trimmed close after stitching and left in place permanently, so it goes on carrying the design for the life of the garment. It is the choice for knits and stretch goods, where the cloth cannot hold a dense design still by itself; tearaway is pulled off and leaves the fabric on its own. Weight has to match stitch density, because backing that is too light lets the design tunnel and pucker, and backing that is too heavy stiffens a soft tee and scratches the wearer. The failure usually shows after the first wash, when polos come back with distorted logos and the customer wants the order replaced, long after the run was invoiced.