? about medium weight yarn

I want to try making the sock from Silver’s website. I am wondering if medium weight yarn is the same thing as worsted? I would like to use PatonsDecor yarn.

Yes, Decor is worsted weight. You can tell by the number on the label (4).

Thanks! I never knew what those numbers were for!

Here’s a bit more information:

http://www.yarnstandards.com/weight.html