"Super warm, very comfy, not itchy at all but weird thumb loops."
I have worn this piece everyday since opening it! So so warm and but not bulky at all. I know people have been singing the praises of merino for years but I never really got on board because i'm such a baby about things itching my neck. This has NO NECK ITCH, and is so warm and close fitting that I don't even need to wear a scarf outside. I'm 125 lbs and 5'8" and wear a small. One complaint -- the thumb loops. The loops are so weirdly tight. I can put my thumb in but its not very comfortable at all. If you're getting this piece for the thumb loops (not lying, this was a pretty high priority for me), I'd look elsewhere. THAT BEING SAID, I am still really happy with this purchase.