These tees can't be beat.  I now own 5, in two different sizes.  They run a little larger than other Woolx items.  I wear XL turtleneck and this XL tee fits over the outside of it, for a little extra warmth.  I've bought size L to wear over biking jerseys.  Size down one size from your regular Woolx size for next-to-body fit.
They are soft as silk, lightweight, durable, and warm.  The length is nice and long, the sleeves are not too short, not too long, the neckline is perfect.  Woolx really does their homework when designing their products.  I am a desperately loyal customer with a whole dresser full of fabulous, perfect fitting merino tops and bottoms.  Thank you so so much!!!!