Icebreaker  Merino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's

One of my favorite base layer tops, I’m 5’9” fluctuate between 148-155lbs lbs w/light muscle tone and got a medium. The sleeves are long enough for tall women. Great length through the torso too. Neckline is really comfortable. Fabric is a soft and not itchy wool, it is wool though… so don’t expect it to be silky smooth. I wear this under a jacket snowboarding for 20-35° ish nights, I add a light fleece if it’s colder than that. And wear just a shell over this if it’s a warmer day. Keeps me dry and pulls the sweat away from my body all day without getting the top stinky. I also like to just wear it around the house on chilly nights.

This is a great base layer and/or wool top but PLEASE include washing instructions on your site! Now that I have it, here's what others should know up front: Machine wash warm; do not tumble dry or dry clean; warm iron; line dry or dry flat.

After reviewing different types of base layers- wool synthetic, blend- I decided I wanted wool because of it's wicking, warmth, and antimicrobial properties. I tried on a bunch of shirts at different weights to find which would be most comfortable- snug but not too tight, warm but not too hot, and something that wouldn't be itchy as I have a bit of a wool allergy. Smartwool socks have never bothered me, but rough wool sweaters are a no. I settled on this shirt for a few reasons: it fit right, it was soft and didn't make me feel itchy, and it was that much cheaper than Smartwool or other brands. I've used it for a couple months now and even when I get sweaty while hiking I don't get itchy. And it's the right amount of added warmth for winters in south central WI. I've never gotten too hot or too cold while hiking in ~20 degrees with wind chills lower. So it works perfect for me!

The shirt is comfortable and lightweight. I wore it on a hike that started off with rain and hail (lots of layers to start), and I stayed dry, even after needing to remove most of the layers after the weather cleared up. I ordered a small, which is form-fitting for my 5'7", 127 lb. (32" band size), size 4 dress size self. I'm happy that the shoulders aren't too narrow, and the sleeve length is good. The fabric is stretchy, but if you have some decent-sized biceps, you might want to size up.

I've had an Icebreaker 200 top for maybe 6 years and love it for its lightness and warmth. And durability. When I found the same thing (finally!) at REI on sale, I grabbed two, the sage green and the mushroom color called mink. The new ones seem cut a little tighter, though not by much: they may loosen a bit with wearing and they still fit fine. Since I got them I've had one or the other on almost every day. They're a great first layer, lovely against the skin and warm for such a light weight top.

I have a couple Oasis tops that are my daily wear in cold weather (and that includes chilly summer nights camping in MN). I'm 5'10' and lanky with a normal torso length for my height, but with slightly long arms...definitely a long torso and arms when compared to the typical size L. Icebreaker considers this top to be a snug fit, but for me a size up from my normal base layer size means this is a long sleeved shaped merino t-shirt, perfect length for my torso, that I wear constantly in winter.

I purchased the flash color in XL and found that the cut is much slimmer than other tops by Icebreaker such as the Sphere and the tech lite.

I tried this top on in store. It was a perfect fit. I ordered it online and it was 2 inches shorter in the sleeves and 1.5 inches shorter in length. It didn’t fit the way I like. I returned to the store and found this item has 2 versions. Name and price are the same. An additional tag on one says ‘Bodyfit’ and the other version says ‘Merino wool’. Both are 100% merino wool. I pointed this out to the salesperson and she said she would try to figure it out. Online description of shirt length matches what fit me but what I received was much shorter. I was disappointed as I ordered 3 colors and returned all 3. I purchased the one in the store in ‘Bodyfit’.

Love this base layer!! Wore it for my last 3 days hiking mt. Kilimanjaro and it worked so well!! I was warm, it was an easy layer to shed down to, and did not smell or seem damp/musty at the end of the day. Fit is TTS - I tried medium and small, kept the small (usual size, but sometimes I think merino can run on the smaller side, this I definitely felt was TTS)

How is merino wool always the perfect amount of warmth? This shirt does not disappoint. So comfortable. Bonus is that you can wear it days in a row without washing. Smells new and clean.