Worsted-weight yarn is great for sweaters, shawls, and hats.
I currently have two worsted-weight yarn bases. The first is Wonderful Worsted, which is a squishy 100% superwash merino yarn base with 4 plies and 218 yards per 100 gram skein.
The second is Squoosh Worsted, which is just like my Squoosh DK yarn base. It comes in big 4 ounce skeins with 213 yards per skein, and it is made of extra-soft superwash merino. It is a little heavier than Wonderful Worsted.