I love my Stoic Merino Crew Shirt - it's crazy soft and fits me perfectly in a M at 5'11" and 175 lbs. I've had it out a bit and it does everything a merino baselayer should (wicks vapor and doesn't stink).

Got two of these on SAC too for half the price. I'm 6'3" and weight 172lbs: M fits perfectly.
They are very comfortable, long sleeves with nice thumb holes, good length looks awesome.
I am definitely going to use them for snowboarding and climbing this winter. Merino wool is the bomb and keep your nasty smells away from your peers :)

I am 6'6" with a 48" chest and I went with an XXL--I am glad that I did. It has a nice athletic fit, without being skin tight which is what I wanted. The body is a great length, and the arms are even long on me (which I like)!

If you are familiar with the Backcountry.com long-sleeve merino crew shirts, you will be happy to know that the thumb-holes are usable, and in the correct spot.

Finally, the weight. I would estimate the weight to be about 120g/m2 (maybe 140g/m2 at the most). It feels about the same weight as the Backcountry.com short-sleeve merino shirts or a SmartWool microweight. The merino soft, and of good quality.

I read the reviews and wanted it to feel/look more like a shirt so i bumped up to an XXL at 6'2 230 and honestly i absolutely love the fit of the shirt. The arms are only just a tad long, even at a bumped size, but comfort/feel is not affected at all by this and they fully stay up on my wrist. But, to me, this makes using the thumb holes even more relaxed and comfortable. At the S&C price this shirt is the best 30 bucks you can spend. Even at $60 its cheaper and imo softer/more durable than any of the other merino shirts. Oh yea, and its made in canada.

6'0", 130 lbs, medium is perfect (although w/ thumbs in holes the sleeves would ideally be ~1 cm longer)

1. When my thumbs are in the holes, the sleeve seam runs right across my elbow. Since the thread is not nearly as nice as the wool, this is noticeable and uncomfortable with the friction caused by bending my arm. However, this is only a problem if you use the thumbholes; otherwise, you can simply rotate the seam away from the elbow.

2. The thumbholes are slightly too small for my thumbs. Seems like it wouldn't be all that bad to have slightly larger holes, even if your thumbs weren't that big.

I'm 6'4" and 210 lbs. I got the XXL in black and red and love them both. I up sized a bit from the chart intentionally and the shirts fit long enough for my 6'6" wingspan and are a perfect athletic fit. The XL would have fit as well, I'm sure, but would have been skin tight and I was looking for a shirt that I could wear and not look like a complete meathead.

I am at 5'11", 185lbs, and a 44" chest, and I find the large is tight under the armpits and around the shoulder blades. I think it's going to be a bit annoying during a full day of wearing this shirt. I really like the quality and would classify it as "very lightweight". I would have to say the sizing chart is meant to be for a tight, close to the skin fit. Great fitting cut if you don't have broad shoulders.

Like others have said, the arms are loooooooooong.

Quality of the wool seems nice but the arm length is a deal breaker.

Great shirt, nice soft wool, appears to be constructed very well and the cut is nice. The sizing chart seems accurate enough, but if your chest is on the upper end of a size, I would recommend going up to the next size. I'm 6'3"and a very athletic 200lbs and I should have sized up to an XL. The large is a little snug under the armpits, not even really annoying, but just not perfect.

For those who have purchased and loved BC's house-brand merino wool shirts, you'll recognize this as virtually the same sizing and feel as before. Very soft and not itchy at all.

I'm almost 6'2", 180 lbs, athletic build and the large fits great. These would also work great for tall, skinny people if you don't want to use the thumbholes.

Finally a shirt with a great athletic cut that doesn't restrict movement at all. I got mine from Steep and Cheap for half the price and I plan on buying another one. I'm 5'10", 170, athletic body, and medium fits me perfectly - tighter than on the BC model who looks malnourished by the way.. What I like the most is the generous length and the extra long sleeves with thumb holes. The shirt is paper thin, very comfortable and doesn't itch at all. Made in Canada!

Wasn't sure what this would be like when I bought it on SAC - no reviews were up yet - but I am pleasantly surprised. The wool feels awesome. It's comparable to the Smartwool Microweight crew, but the Stoic feels much smoother. And it has a tail and thumbholes too! XL fit me nicely, though the sleeves were a big long (I'm 5'10" - 220 - 46S blazer, so sleeves are :always: too long).

Bought this for my bf who works outside in freezing temps and wind. He loves the softness and the warmth and the ease of layering. We'll use it backpacking too - he wants me to order him some more! Great buy - fits true to size for him.

I have been on a few runs with this shirt so far in around 38-42 degree weather and it is just perfect! I thought, like some of the reviews, that the armpits were a little snug but otherwise the Large fit me perfectly (5'11" 210 lbs 45.5" chest)

I am definitely going to buy a few more of these for my early morning runs, probably in Large because I didn't notice the armpits while running (and not thinking about it). If you are muscular and think it would annoy you size up, but be warned the sleeves will be very long.

This shirt is nice, thin fabric, quite stretchy, tight fitting. Overall I like it. The chest measurements might run a hair small, but if it is a base layer then it should be snug anyway. The arms are quite long though. The chest is just right for me, and the sleeves extend just past my fingertips. The length doesn't make them particularly uncomfortable or anything, they are just long.

Overall happy with the purchase at the SAC price.