Cut-away stays permanently behind the embroidery and is trimmed around it, while tear-away is torn off after stitching. On knits you should generally choose cut-away, because the fabric stretches and needs permanent support, otherwise the embroidery distorts after a few washes.
Tear-away suits stable woven fabrics and light designs. On thin knits use a light cut-away, a no-show or mesh type, so it is not visible and does not irritate the skin. On heavy fabrics, two layers of stabiliser give a cleaner result.



