Love it so much I just bought a second. Great comfortable material and very stylish, sharp. I got a large (and fits fine, but XL probably would have worked too). Also, just picked up a XXL for home/pj.
6', 160lbs. Usually North American medium, Euro large.

Super high-quality T shirt at a good price. The T Shirt is as high-quality as Castelli's kits which is nice. Fits great, looks great, what's not to like.

i bought this tee about 2 weeks ago. 5-11 and 180 ..bought xl and fits really good, really comfortable and stylish tee shirt, i would defenitely buy another. runs a little small , i usually where a large

I purchased the Black version in Medium. It is just a good looking T-Shirt. It fits snug like a Castelli jersey, so you might want to size-up, but I wear a Medium jersey and the medium shirt fits just fine, if a bit snug.
The fabric is thicker than most t shirts, but I see that as a plus. It's just a good looking, comfortable shirt. I'll get a few more if they go on sale again. Recommended.

Castelli t-shirts are my favorites, good design and good quality.. only thing to keep in mind is they run VERY small.. I am 5.11 / 180lbs and have get XL.