Chunky or bulky yarns are knit on needles US 10 through 11. Many newer yarns are using US 15 & 17 needles. A great choice for quick knitting, in some cases they produce a fabric heavy enough to wear in place of a coat. Many of the new "bulky" weights knit quickly but are lighter in weight providing warmth with out the bulk. Look for gauges of 2 to 3.5 sts to the inch. This category has a variety of fiber choices.