Okay...THIS is my favorite!
It's not a true sock yarn, there's no nylon in it, so if you want to use it in the "Apple Tree" Sock pattern that's also available, you'll need a red, green or brown reinforcement thread for the bottom of the foot areas....or just wear them in bed. :)
This yarn is PERFECT for a sweater!
Select 17 Merino DK
100% 17 Micron Merino SW