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Yarns Sorted by Weight
Well, every time we think there's a correct way to sort yarns into groups that can be used one for another, we hit a snag. The truth is that there is so much variation in yarns that it's impossible to have absolute rules on substitutions.

The Craft Yarn Council of America (CYCA) developed those handy little skeins with the numbers on them, 0 through 6, but still that isn't a complete answer for yarn substitution. There's a lot of variation among all those "4" yarns. The plain truth is you have to look at all these things, and use the infallible computer we all have (your brain!) to figure it out. Start with common sense--narrow things down first by general terms, then continue from there. You'll notice that the #3,4,&5 groups are bigger, and have more variation within them, than the thinner yarns.

What are the things that you should consider when substituting yarns? Gauge of course, but also the fiber used, smoothness, regular or irregular spin, indoor or outdoor use, and the draping of it (limp to stiff). And how do you tell these things? Sometimes it's really tough--even the color of the dye can make a difference in how a yarn works up.

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Uni Merino Mini 4ply yarn in 25 g skeins Gossypium Cotton Yarn by Erika Knight Lett-Lopi Icelandic Wool
Uni Merino Mini 4ply yarn in 25 g skeins
List Price : $5.50
Our Price $4.25
Gossypium Cotton Yarn by Erika Knight
Regular Retail Price $6.00
Our Price $5.50

(6)
Lett-Lopi Icelandic Wool
Our Price $5.75

(64)
Einband Laceweight Lopi Icelandic Wool British Blue Wool by Erika Knight Rhythm Superwash by Jojoland
British Blue Wool by Erika Knight
Regular Retail Price $7.25
Our Price $6.20

(7)
Rhythm Superwash by Jojoland
Regular Retail Price $6.50
Our Price $6.39

(15)
Novena Merino and Baby Alpaca Yarn by Lang Flax Fiber Natura Sport weight Linen Peter Pan Baby Cotton
Novena
Our Price $6.95

(5)
Flax Fibra Natura Sport weight Linen
Regular Retail Price $8.00
Our Price $6.95

(9)
Peter Pan Baby Cotton
Our Price $6.95

(1)
Alpaca SuperLight by Lang Yarn Fortissima Socka 4-Ply Fortissima Socka 6-Ply
Alpaca SuperLight
Our Price $6.99

(16)
Fortissima Socka 4-Ply
Regular Retail Price $7.95
Our Price $7.29

(4)
Fortissima Socka 6-Ply
Regular Retail Price $7.95
Our Price $7.75

(2)
Passione Baby Alpaca Blend Yarn by Lang EcoPuna Baby Special Black DK yarn by Amano of Peru Suri Alpaca Yarn by Lang