How to Choose Base Layers
REI Co-op Merino 185 Long-Sleeve Base Layer Top - Women's
$79.95
Beloved while sweating on the trail—and sleeping in the tent—the ultrafine merino wool of the women's REI Co-op Merino 185 long-sleeve base layer top is soft, breathable and naturally odor resistant.
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- Made of 100% ultrafine 185 g merino wool for a soft feel without any itchiness
- Merino wool naturally breathes, wicks away sweat, dries quickly and resists odors, making it an ideal multiday trip companion
- UPF 30 sun protection
- Flat seams and merrow stitch construction eliminate chafing
- Underarm gussets allow full range of movement
- Designed to hug the body for optimum performance
- Center back length: 27 in.; average weight: 4.7 oz.
- Machine wash warm, gentle cycle, with wool wash product; do not twist or wring; remove promptly; do not bleach; tumble dry low; dry cleaning not recommended
- Field-tested on its own and as a base layer while hiking, running, rock climbing, cycling, skiing and camping in diverse climates across the U.S.
- Made in a Fair Trade Certified™ factory
- REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world
Imported.
View the REI Co-op Merino 185 Product LineView all REI Co-op Women's Base Layer Tops| Best Use | Multisport |
|---|---|
| Shirt Type | T-shirt |
| Fabric | 100% merino wool |
| Sun-Protective Fabric | Yes |
| UPF Rating | 30 |
| Moisture Wicking | Yes |
| Quick Drying | Yes |
| Underwear Weight | Lightweight |
| Sleeve Length | Long Sleeve |
| Gender | Women's |
| Sustainability | Fair Trade Certified™ factory From a Climate Label Certified brand |
REI Co-op Clothing - Women's
| XXS | XS | S | M | L | XL | 1X | 2X | 3X | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18W | 20W | 22W | 24W | 26W | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Numerical Size | 00 | 0-2 | 4-6 | 8-10 | 12-14 | 16 | 18 | 20-22 | 24-26 | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 |
| Bust | 31 | 32-33 | 34-35 | 36-37 | 38.5-40 | 41-42.5 | 43-45 | 47-49 | 51-53 | 32 | 33 | 34 | 35 | 36 | 37 | 38.5 | 40 | 42.5 | 45 | 47 | 49 | 51 | 53 |
| Sleeve Length | 29.5 | 30 | 30.5 | 31 | 31.5 | 32 | 32.5 | 33.5 | 34.5 | 30 | 30 | 30.5 | 30.5 | 31 | 31 | 31.5 | 31.5 | 32 | 32.5 | 33.5 | 33.5 | 34.5 | 34.5 |
| Waist | 24.5 | 25.5-26.5 | 27.5-28.5 | 29.5-30.5 | 32-33.5 | 34.5-36.5 | 37.5-39.5 | 40.5-42.5 | 44.5-46.5 | 25.5 | 26.5 | 27.5 | 28.5 | 29.5 | 30.5 | 32 | 33.5 | 36 | 38.5 | 40.5 | 42.5 | 44.5 | 46.5 |
| Hip | 34 | 35-36 | 37-38 | 39-40 | 41.5-43 | 44-46 | 47-49 | 50-52 | 54-56 | 35 | 36 | 37 | 38 | 39 | 40 | 41.5 | 43 | 45.5 | 48 | 50 | 52 | 54 | 56 |
| Inseam | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 |
Sizing Notes
Measurements are stated in inches unless otherwise indicated. Size chart values represent body measurements, not garment measurements. Some women's pants are available in petite and tall sizes. Typically petite sizes fit women 4'11" to 5'3". Regular sizes fit women 5'4" to 5'8". Tall sizes fit women 5'9" to 5'11".
PETITE: Generally, as compared to regular sizes, petite sizes are 2.5 inches shorter in inseam, 1 inch shorter in body length, 1.25 inches shorter in sleeve length and ¾ inch shorter in total rise.
TALL: tall sizes are 3 inches longer in inseam, 2 inches longer in body length, 2.5 inches longer in sleeve length and 1.25 inches longer in total rise.
Capri or cropped pants have an intentionally shorter inseam—reference the technical specs instead of this chart.
Inseam is measured to the floor.
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Most Helpful Favorable Review
Good but needs consistent sizing
Jay M2 years ago
I bought two of these in medium, lost a little weight before I needed them so I exchanged both to smalls. One small fit great and the other was way too tight, so I had to return that one the store to get back my original medium. Confused about why this small size didn't fit and why I bought medium to begin with if one shirt was too big for me, I carefully checked the sizes by holding size mediums in different colors at the armpit area for consistency. The lack of quality control was astonishing for REI. Here you can see two black shirts where one looked to be an inch wider than the other, unless someone wore it and stretched it out before returning it (but my better guess is labeled incorrectly). Then you can see two other sumac and mauve colors where the sumac was slightly longer and wider. I am happy with my purchase in the end, even though yes the wool is a little itchy as others commented it has kept me warm. But I would caution everyone about the inconsistent sizing. It took a lot longer than I anticipated trying them out in the store.
Jay M
52 people found this review helpful
Most Helpful Critical Review
Twists
Belleness3 years ago
This top was great as a base layer for a day on the slopes. I washed it according to the instructions but noticed the whole top had twisted when I pulled it out to dry. The side seam was now in the front of the garment and the neck/shoulders twisted the opposite direction. Really disappointed, especially as the product photos show the grain of the fabric straight.
Belleness
Los Angeles, CA
52 people found this review helpful
Customer Images
Jay M
Good but needs consistent sizing
2 years ago
I bought two of these in medium, lost a little weight before I needed them so I exchanged both to smalls. One small fit great and the other was way too tight, so I had to return that one the store to get back my original medium. Confused about why this small size didn't fit and why I bought medium to begin with if one shirt was too big for me, I carefully checked the sizes by holding size mediums in different colors at the armpit area for consistency. The lack of quality control was astonishing for REI. Here you can see two black shirts where one looked to be an inch wider than the other, unless someone wore it and stretched it out before returning it (but my better guess is labeled incorrectly). Then you can see two other sumac and mauve colors where the sumac was slightly longer and wider. I am happy with my purchase in the end, even though yes the wool is a little itchy as others commented it has kept me warm. But I would caution everyone about the inconsistent sizing. It took a lot longer than I anticipated trying them out in the store.
Height:5'2"
Weight:125–150 lbs.
Yes , I recommend this product
trailblazer
Keeps me warm, but has quality issues
6 months ago
Interested in the product because I needed a lightweight baselayer for a winter trip. Worked well once, until it started quickly forming holes. There seems to be a quality assurance issue with this product. Sadly beyond the return video. I would suggest avoiding this product and looking to some brands with more reliability.
Age:25–34
Weight:150–175 lbs.
Height:5'9"
No, I do not recommend this product
Belleness
Los Angeles, CA
Twists
3 years ago
This top was great as a base layer for a day on the slopes. I washed it according to the instructions but noticed the whole top had twisted when I pulled it out to dry. The side seam was now in the front of the garment and the neck/shoulders twisted the opposite direction. Really disappointed, especially as the product photos show the grain of the fabric straight.
Age:25–34
Weight:150–175 lbs.
Height:5'5"
No, I do not recommend this product
Meg
Chicago, IL
The real MVP for traveling
2 years ago
This top was my most-worn article of clothing on a recent 15-day trip to Ireland and Scotland! I only bring a carry-on bag and a small backpack when I travel, so I needed something that met all of these criteria: could be worn many times without getting smelly, would work well for a few days of hiking, and would look casual/cute rather than super sporty in photos. This absolutely fit the bill! I think I wore it for a total of eight days--including multiple days of hiking and sweating a fair amount--and it still wasn't smelly. I rinsed/gently scrubbed the collar in the sink once to get rid of sunscreen marks, and it was dry by the next morning and ready to be worn again. Temperatures ranged from 50s to 70s throughout the trip, and I was always comfortable wearing this and just pushed up the sleeves if needed when it was warmer. On another note, I'm tall (6'0") and the length/sleeves of the large were long enough for me.
Age:25–34
Weight:175–200 lbs.
Height:6'0"
Yes , I recommend this product
Anchmom
Colorado
THE BEST wool base layer.
3 years ago
I love these tops. I am now fortunate to have 3 of them. They are SUPER durable, with a nice tight weave. They don't pill at all, and I am not kind to mine - normal wash and dryer, and they don't shrink, don't stink, and seem like they will last forever. They are flattering, and the seaming is thoughtfully placed AND looks nice. I'm not a fan of tight tops - I am 5'6", 148#, big shoulders, 30 inch waist, short waisted. I wear these in a large. They are a little too long in that size for my taste, but I'd rather the extra length than a tight fit. Highly recommend these for a warm, durable base layer.
Age:45–54
Weight:125–150 lbs.
Height:5'6"
Yes , I recommend this product
JayB
Phoenix, AZ
Itchy, twists irreparably after 1 wash
1 year ago
At first I liked this shirt, liked the weight of it for the colder months in AZ. However, I did find it itchier than a similar Smartwool top. The dealbreaker for me is that after one wash, with 0 drying, this shirt twisted the fabric almost 25% to one side. For a shirt that has body contouring seams, the amount of twisting in the fabric is ridiculous. Who wants uneven body contouring seams? It's a neurodivergent person's nightmare. I'm going to have to hustle to return this and find something else for my upcoming trip. FWIW, I found the Smartwool top to also twist but not as much and was actually able to twist it back, mostly. Who has time for fabric blocking when you're traveling/hiking?
Age:35–44
Weight:175–200 lbs.
Height:5'9"
Lady Firedog
North Alabama
Improved Design and Quality
2 years ago
I have an older print REI Merino shirt I bought a couple years ago on clearance and although it has held up well (always machine-washed and hung to dry), these new ones are cut slightly different, seem to be softer and fit better. I hope they last as long as my old one! Please offer more colors, and the same 100 percent Merino in short sleeves and tanks?
Age:55–64
Weight:125–150 lbs.
Height:5'5"
Yes , I recommend this product
LadyFiredog
Great Quality and Fit - Please Don't Change Them!
1 year ago
I have several of these tops and bottoms and they have all worn well (I machine wash, hang dry). Impressed with the quality over more expensive brands, as they seem to feel softer than some and fit better. Pretty please: Dispense with the weird orange and dingy taupe patterns, or at least add some more attractive colors/patterns; I'm to the point I cannot resist stealing these out of my hiking stash for everyday wear! And please make some 100% Merino tanks; Tencel blend is not the same.
ASDLKJ907
Anchorage, AK
Worst seams ever
2 years ago
This kept me warm enough, but the tight neck and aggressively noticeable seams are pretty unbearable. There are three seams going down the arm for absolutely no reason except to chafe and irritate your skin. Would not recommend unless you're a highly unbothered person when it comes to materials.
Height:5'8"
Age:25–34
Weight:100–125 lbs.
No, I do not recommend this product
Babs
Bozeman Montana
Favorite shirt
2 years ago
Great weight fabric for year-round wear.
Age:65–74
Weight:100–125 lbs.
Height:Shorter than 5'
Yes , I recommend this product
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