This is a great base layer! The merino wool rings true to what you should expect from that material. It fits true to size although it seemed to run a little long in the body and sleeves, but that was a bit of a plus for me. They do stretch a little but always go right back to shape. These are very versatile and extremely insulating and a great addition to the collection!

I spent an entire month long expedition in the Merino Zip Tee recently. It performed relatively well, but the white sleeves became brown in a matter of days and holes emerged where my backpack rubbed against the shirt within about a week. I also feel that while this wool may make you smell less bad in a typical human BO kind of way, in the end you still smell bad, just a different kind of bad. Maybe more like a "wet sheep" as the other reviewer said.

In any case, the shirt worked well to deflect the sun (we were on glacier most of the time) and managed heat and moisture just fine. It did stay damp for longer than I expected, but I didn't feel cold in it when it was damp like I would with a synthetic baselayer.

Also, after two washes the sleeves are still brown :( Its probably not going to make it after what I put it through.

I like this shirt alot, but the color bugs me. It doesn't stop me from wearing it though... The thumb holes are great, I still can't believe that they only seem to be on wool long sleeves. Made in China (Bummer for some)

I'll admit, I'm not average in proportion, but XL fits my 6'4" frame and gives me room in the sleeves and the torso. Fits close like it should. I'm only 205 lbs however so you don't want to carry much extra weight around to slide into this shirt.

okay, maybe not quite as nice as the sugoi merino baselayer but this one still gets the job done. colors are a little wild, but hey it's a baselayer - you wear other stuff over it!

The zip is very long for a baselayer, it's over half length almost 3/4. So you can really open it up if you get warm

Picked this up on SAC about 8 months ago. It has become my go to, first choice, base layer whenever it is clean. The merino wool is comfortable, wicks well, and doesn't smell after several straight days of use. I didn't like the thumb holes at first, but eventually grew to really like use them all the time. I have also started wearing this as a long sleeve running shirt on cooler days. One last comment is that, through constant use the shirt has held up great, the only that has came off is the backcountrys goat!

The tailoring on the shirt is great for an athletic build. I'm 6' 170lbs and the medium fits snug like a base layer should. The longer sleeves are a welcome relief during activities like skiing and hiking compared to 'standard' long sleeves which tend to ride up the forearms. My only complaint was the unexpected "wet sheep" smell that comes about when the shirt gets wet. The smell faded after some washing, but was a bit of a turn off.

this sizing is crazy! I'm 5'8" - 140lbs. I ordered size small. The sleeves hand down to the middle knuckle, and the hem of the shirt goes down to my crotch, like a friggin miniskirt!! Yet it is uncomfortably tight all around my armpits and chest. Someone said it fits like a sausage casing - I would agree - and that would be fine since it would be used as a baselayer, so long as it didn't hang down to my crotch and have sleeves for someone with 35 or 36 inch arms!

honestly, the small would fit someone who is 6ft, 140lbs probably, but not if you're shorter or heavier than that.

totally returning this - sizing is messed up! This is why this item is on SAC with almost 900 pieces in stock! there should be a disclaimer when ordering it!

Perfect layer for those chilly mornings biking, boarding, skiing, dirt biking, etc. I'm 6'1" and purchased the large and it fits perfectly. The thumb loops keep the sleeves from bunching up when putting your jacket on. Keeps you dry and warm all day long. The color is true and nice.

Great as the underlayer, and fits snug without being restrictive. Like that it zips halfway down - releases the heat on those days where it warms up fast. The longer sleeves and cuff are a nice touch - don't have to worry about the sleeves creeping up when pulling on a fleeze jacket.

i have tons of merino stuff- it's the best fabric unless it's really hot out. this is a nice shirt. got it for an unbelievable price on S/C. nice trim fit (i got a large - 175 lbs 6 feet). only thing not perfect is the thumbhole location, for me. my thumb is on the side of my hand, not the back where my ring finger is. but i don't even use that anyway. very nice finish on the shirt, and i like the color. i wear it as a single outerlayer.

Fit is like above statement. Except the neck, its not snug when zipped, sloppy. And the color is kinda flamboyant for a mens shirt, its lighter than the representation pic.

I'm a 6'2" ex-collegiate swimmer and this LS tee fits perfectly on my 'gangly' arms, long torso, and big shoulders. Fit is slim and tight, but that's what it was designed for. Great as a baselayer (thumbholes are money when snowboarding) and a perfect combo of warmth and weight for a cool morning run. Say adios to the (minimal) itch after a wash or two.

I wish I'd bought 3!

The Wool insulates and breathes while the zip dumps heat. This piece never gets smelly or irritable against your skin. It works well with a Rime or R1 pullover and still allows for the zip to function. Thumbholes are choice, as is the subdued logo. I will have this for quite some time.

I love this shirt. It's great for everything I do - cycling, hiking, snowboarding (although I found it to be TOO warm under my down), even rafting in 40 degree water in 50 degree weather! I scored it off SAC for cheap, but it's worth the full price (wish I had money for more). The only reason I give it four stars is because the thumb holes are a big too small for my large hands, and they seem to be placed in a peculiar area that causes twisting in the sleeve.

Looks great, but I had to exchange the medium for a large- it was pretty small. Also, the sleeves appear white in the photo- they are actually light gray.

Great price for awesome Merino layer. Sleeves with thumb hole are a plus, keep em in place. Have worn it in 0-20 degree days in Summit Co. with only a t-shirt and then my 686 coat/liner. No problem. Large zipper allows you to dump heat when it adds up.

I got this as a baselayer for my boyfriend, and he has really been enjoying it for skiing both in the resort and when touring. Merino wool isn't itchy, and it stays warmer than synthetics when damp/wet. Wool also doesn't stink as much. This is a nice light-weight top, though the arms are a quite long and are too big on him. The other thing he'd change on this Backcountry.com piece is there is a lot of fabric around the thumb loops adding a bit of bulk. This is a tight fit, but that's good for a baselayer. All in all, we'd recommend it!