What is "Double Knit Wool"?

I have just been reading a pattern which says to use 'Double Knit Wool’
Can someone tell me what that is and what ply it is please?

Double knit is a weight (DK)…it’s heavier than sport weight, but not as thick as worsted. There’s a more thorough explanation here. :smiley:

I’ve always understood that DK is about half of worsted weight–closest to sport weight.

I’m glad someone asked this… I had wondered about this and I also didn’t know what DK meant in a pattern. And now I do :smiley: