Double knit yarn, also known as DK yarn, is a medium-weight yarn that is finer than aran or chunky alternatives but thicker than lace-weight yarn. It is defined as an 8-ply thread that has between 11-14 wraps per inch, resulting in around 200-250 meters per 100 grams. The recommended needle size is 3.75 – 4.5 mm to achieve a gauge range in stockinette stitches of between 21-24 stitches per 4 inches. DK yarn is versatile and comes in a wide range of colors, making it perfect for everything from hats and scarves to sweaters and baby blankets. It is also a great choice for garments since it is a lighter-weight yarn that doesnt look too heavy or bulky. Double knitting yarn is called so because it is twice as thick as fingering weight yarn. However, the term "double knitting" can also refer to a knitting technique or holding two lengths of yarn together while knitting or crocheting. DK weight yarn is sometimes labeled with "size 3" or "light" in the US.