Aran weight yarn is a fabulous choice for garments, accessories and homeware. It knits on a 4.5 mm. (US 7) to 5 mm. (US 8) needle, and is perfect for patterns that include cables and other textural stitches. It is interchangeable with Worsted weight yarn, which is slightly finer. Aran weight is sometimes known as Heavy Worsted or 10 Ply, too.