What does 4 mean in yarn?
Each number is actually a category that contains a group of thicknesses. For example, ‘4’ contains: worsted, afghan and aran yarns… and the recommended needle size ranges from 7 to 9 (and hooks from I to K).
What weight is 4 ply yarn?
Fingering weight (traditionally 4ply) 19-22. Sport weight 15-18.