Premier Yarns-Washi Yarn. Washi is the ideal yarn for any item intended for tough scrubbing. Whether you are making dishcloths, bath poufs, or back scrubbers, the durable polyester loops of Washi will create the perfect texture in knit or crochet. Weight Category: 4. Content: 100% Polyester. Putup: 3.5oz/100g, 92yd/85m. Gauge: 16sx21r = 4in/10cm on US8/5mm knitting needles. Suggested crochet hook size: USI9/5.5mm. Dylotted: we try but are not always able to match dyelots. Care: machine wash, machine dry, do not iron, do not bleach, dry clean using P solvents. Comes in a variety of colors.