Triple knit wool isn't known by that name in the knitting and crochet circles. Double knit wool, however, is well known. You can find the name on the yarn's packaging abbreviated by a "dk" symbol. Triple knit wool is packaged as worsted, bulk or Aran yarn. The Aran name comes from an island in Ireland known for a wool that is weatherproof.
In the knitting world, yarn is measured by it length and weight. The weight, however, is more than the density of the yarn. The yarn weight is also described in the number of strands of material used to make up one yarn string. Double knit is a weight designation given to yarns with two or four strands per yarn string. Triple knit yarn has three or six. The weight in knits isn't the only differences between the two types of yarn.
Double knit wool can produce 14 stitches every 4 inches when used in a crochet project. Triple wool knit produces 12 to 16 stitches every 4 inches when crocheted. Both types of wool produce 32 knitted stitches every 4 inches. These numbers vary by the types of stitches made and project you are working on. The size of the crochet or knitting needles also make a difference in the stitches produced.
Worsted weight or triple knit wool yarn is much heavier than double knit wool, but the two are interchangeable in a project. Worsted wool yarn is used to make a heavier knitted or crocheted product (sweater, scarf, etc.) than the double knit wool.
Double knit and triple knit wool yarn both have their ideal uses. Triple knit wool is best on winter clothing where the bulk is necessary. Mittens, scarves, afghans and sweaters work well with worsted knit yarn. Double knit wool is used in creating clothing for children because it is lighter to carry on the body. Vests, ponchos, purses and crocheted toys are created with double knit wool yarn because of its weight and the strength it has over lighter weight yarns.
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