This was exactly what I was looking for! I have been searching for a 100% merino wool t-shirt that was not too loose or too tight, and from a company I could feel connected to. I always try to support US-based and family-owned businesses, and this shirt is made in the US.
In regards to sizing, I am 5'11, 170 pounds, with a slim-athletic build and the large fits me perfectly. It has great sizing and is not too loose around the arms or the body, and holds its shape well. It might be a slight bit long for some, but that is subjective. Just be gentle with the neckline as it can lose a bit of shape. Highly recommend!