Cotton Embroidery Floss DMC 3371 DMC Cotton Embroidery Floss is a soft thread made from 100% long staple Egyptian cotton and double mercerized to give it brilliant sheen. This superior quality thread is perfect for stitching on all types of fabric. Double mercerized for brilliant sheen.Comprised of 6 size 25 easily separated strands. 100% colorfast and fade resistant. The Floss can be washed at very high temperatures 95° C/203° F. Particular attention should be paid to the fabric on which the thread was embroidered. Length: 8m.