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Sport weight yarn is one of the lesser known weights available on the UK market. However, it has long been popular in the United States, where it is often used for knitting patterns and baby clothes. Some people refer to it as 5-ply yarn because it is thicker than 4-ply but thinner than DK wool. Those using sport weight yarn typically use 3.5mm to 4mm knitting needles or crochet hooks.