Smartwool Classic Thermal Merino Crew Base Layer Top - Women's

View the 1149 reviews with an average rating of 4.7 out of 5 stars

$115.00

Delivering exceptional performance and improved functionality, the women's Smartwool Classic Thermal Merino crew base layer top maintains your warmth and comfort as you hike, ski, bike and more.

$115.00

$59.83

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250-weight Interlock-knit merino wool enhances comfort, breathability, thermoregulation and odor resistance
Updated fit improves functionality and range of motion
Raglan sleeves
Back-to-front wrapping body seam
Flatlock seam construction minimizes chafing

Imported.

View the Smartwool Classic Thermal Merino Product Line View all Smartwool Women's Base Layer Tops

Best Use	Multisport
Shirt Type	T-shirt
Fabric	Merino wool
Moisture Wicking	Yes
Underwear Weight	Midweight
Sleeve Length	Long Sleeve
Gender	Women's
Sustainability	Contains ZQ merino wool

Smartwool Clothing - Women's

	XS	S	M	L	XL	1X	2X	3X	4X
Numerical Size	0 - 2	4 - 6	8 - 10	12 - 14	16 - 18	16 - 18	20 - 22	24 - 26	28 - 30
Chest	32 - 33	34 - 35	36 - 38	39 - 40	41-42	43 - 45	47 - 49	51 - 53	55 - 57
Sleeve Length	27 - 28	28 - 29	29 - 30	30 - 31	31 - 32	31	31	32	33
Waist	24 - 25	26 - 27	28 - 30	31 - 32	33 - 34	39 - 41	43 - 46	47 - 50	52 - 55
Hip	35 - 36	37 - 38	39 - 40	41 - 42	43 - 44	45 - 47	49 - 51	53 - 55	57 - 59
Inseam	29 - 30	30 - 31	31 - 32	32 - 33	33 - 34	30 - 32	30 - 32	30 - 32	30 - 32

Sizing Notes

Measurements are stated in inches.

How to Choose Base Layers

What material is best?

Wool is moisture-wicking and odor-resistant, while synthetic fabrics are more durable and less expensive.

Match the temp to the trek

Lightweight layers are best for moderate to cool temperatures. Midweight layers are best for cold temperatures. Heavyweight layers are best for below-freezing temperatures.

Find your fit

To be able to wick sweat efficiently, your next-to-skin layer needs to actually be next to your skin. A comfortably snug fit everywhere is your goal.

More expert advice

What to Wear Hiking

Layering Basics

Close up of someone that has fallen in the snow and is laughing about it.

How to Choose Insulated Outerwear

Ratings Snapshot

Product Rating

4.7

View the reviews with an average rating of 4.7 out of 5 stars1149 Reviews

326 out of 352 (93%) reviewers recommend this product

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Most Helpful Favorable Review

5 reviews with an average rating of 3.0 out of 5 stars

Not as thick or warm as previous Merino250

Annette

3 years ago

Received free product

I'm in the PNW and wear two Smartwool wool tops I purchased a couple years ago from REI all the time, both were rated as Merino 250. So I did a search on your website for Merino 250 to find another and bought this, as it was listed at Merino 250. I really like that the sleeves are plenty long (5'7", 150#, bought a Medium), and it fits overall really well. However, the thickness and warmth of this top is only slightly more than the Smartwool Merino 150 tops I've previously purchased from REI. This top nowhere near as warm or thick as previous Smartwool Merino 250 tops. It's not warm enough by itself (as the previous tops are ); I will have to layer over it. I'm sad that it appears Smartwool is cutting corners. Just call it a Merino 180 and be truthful!

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Annette

98 people found this review helpful

Most Helpful Critical Review

5 reviews with an average rating of 3.0 out of 5 stars

Not as thick or warm as previous Merino250

Annette

3 years ago

Received free product

Show Full Review

Annette

98 people found this review helpful

Customer Images

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Beee

Pacific Northwest

Rated 5.0 out of 5 stars

2 years ago

Not only is this thermal excellent for temperature regulation, but it's also quite an attractive shirt! I am 5' 10", 140 pounds, and the medium fits perfectly. It's my most-worn long-sleeved shirt by a long shot. If you only air-dry it, and keep it in a bag during washing (we have a spindle-style washing machine, which tends to stretch out items over time), it will last a long time. Just recently I also took a sweater shaver to it, and boy howdy, it looks brand new now! I've even worn this for our engagement photos, which was a perfect Pacific Northwest clothing choice. Love this shirt, and highly recommend it. Sports I use this shirt while doing: hiking, backpacking, cold water sea kayaking (under my drysuit).

Weight:125–150 lbs.

Height:5'10"

Yes , I recommend this product

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Eli Hikes

Havre de Grace. MD

Rated 5.0 out of 5 stars

7 months ago

This is my go to top when I want something basic and to be warm without the bulk and weight of a fleece or other type of top. It's so comfortable and flattering. Wore it throughout my Camino de Santiago in Spain this summer - was in 60s and misty most days of the walking.

Age:45–54

Weight:125–150 lbs.

Height:5'4"

Yes , I recommend this product

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FuzzyGnat

Central Pennsylvania

Rated 5.0 out of 5 stars

1 year ago

Bought this right before a hiking trip in France. I could toss out half my suitcase without missing the clothes in them. But this shirt is saving my bacon! I toss it over a short sleeve layer and can put whatever on top of it (REI Polartec lightweight jacket often, sometimes a not-very-functional Cotapaxi REI rain jacket) and it keeps me both cool AND warm, as needed. And it doesn’t retain BO, apparently, so no need to wash every night. I also brought a Smartwool vest and cannot wait to use it in cooler weather due to kick up tomorrow. I’m going to get more Smartwool and divest myself of some of the less functional REI purchases going forward.

Height:5'4"

Weight:125–150 lbs.

Yes , I recommend this product

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Snow

Denver

Rated 3.0 out of 5 stars

4 years ago

The 250 long sleeve has been my favorite for years. Versatile for running, hiking, and European travel in the shoulder seasons. But the new raglan sleeve design (on right) makes the shirt far less flattering. No longer appealing as outerwear. So disappointed, particularly because it’s one of the few Smartwool products still 100% merino.

Age:55–64

Weight:125–150 lbs.

Height:5'4"

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Annette

Rated 3.0 out of 5 stars

3 years ago

Height:5'7"

No, I do not recommend this product

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Heather

Rated 4.0 out of 5 stars

2 years ago

I love wool clothing and have always been a big fan of Smartwool base layers for their warmth and durability (years). However, the last one of these that I purchased developed small holes where your jeans button goes in just one winter season…the issue is I usually wear with yoga-type pants and only rarely wear with anything with a button. It’s also not a fit issue as the shirt is not tight on me. REI considers this regular wear and tear so return is not an option. If this is standard for Smartwool base layers nowadays, I’ll have to change brands!

Height:5'1"

Age:45–54

Weight:100–125 lbs.

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Judy

Nashville

Rated 2.0 out of 5 stars

4 years ago

I have 20+ Smartwool tops and am disappointed with the new styling and quality. This year I purchased 2 l/s crews, a hoody and 2 pair of pants. I am considering sending 4 of the 5 pieces back do to piling or stitching quality. I have l/s crews that are 15+ years old that look new compared too my new pieces. Also, I have 3 pair Icebreaker pants that I have had about 8 plus years that still look perfect (no pilling). I realize that Smartwool is now part of a large sports clothing conglomerate (VF) but bigger is not better is this case.

No, I do not recommend this product

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YogaJaedra

San Francisco CA

Rated 5.0 out of 5 stars

7 years ago

Moveable, soft, warm. In this top I get to feel good and look good!

Yes , I recommend this product

Originally posted on smartwool.com

Connie Sue

Seattle, WA

Rated 4.0 out of 5 stars

4 years ago

I wear Smartwool 250 all winter, as both under- and outerwear--and also as sleepwear, though it pills when I sleep in it so I use my older items for that. I love the warmth, softness, colors, and lack of plastic/synthetics (but I'm guessing the thread used on the seams is synthetic). This year's model has lost the shoulder seams, which makes the sweater bunch up and sag around my shoulders and armpits - a much less tailored look than the previous sleek, fitted design. I'm disappointed about that and hope the company will reconsider this change.

Age:55–64

Weight:100–125 lbs.

Height:5'9"

Yes , I recommend this product

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Jogging Joan

Greensboro, NC

Rated 5.0 out of 5 stars

1 year ago

This is my second smart wool shirt and I love it! I usually wear a small but purchase a medium in these. I am 5’6” and 135 lbs. Great base layer under a vest and looks like a million bucks!

Age:55–64

Weight:125–150 lbs.

Height:5'6"

Yes , I recommend this product

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Smartwool Classic Thermal Merino Crew Base Layer Top - Women's

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