Classic Thermal Merino Crew Baselayer - Women's
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Classic Thermal Merino Crew Baselayer delivers unmatched warmth and next-to-skin comfort
What Our Gearhead® Experts Are Saying:
“This baselayer is a winter staple for me—soft, warm, and never itchy. It’s perfect for layering on cold ski days, and it doesn’t hold odor, so I can wear it all weekend without worrying about freshness.”
When the temperatures drop and the trail beckons, the Smartwool Classic Thermal Merino Crew Baselayer keeps us warm, dry, and comfortable through every adventure. Made from 100% merino wool in Smartwool’s heaviest 250gsm knit, this baselayer traps warmth while naturally managing moisture and odor, keeping us comfortable no matter how cold or active the day gets.
Flatlock seams and redesigned shoulder panels reduce rubbing under pack straps, while raglan sleeves add freedom of movement for skiing, hiking, or lounging fireside. Soft, breathable, and endlessly reliable, this merino crew is a winter essential we reach for whether we’re layering for a storm day or heading out for an alpine trek.
Details
- Warm, heavy-knit merino baselayer for cold-weather adventures
- 100% merino wool regulates temperature and resists odor naturally
- 250gsm fabric delivers substantial warmth without bulk
- Redesigned shoulder panels minimize friction under backpack straps
- Flatlock seams reduce chafing for all-day comfort
- Slim fit layers easily under jackets or fleeces
- Raglan sleeves enhance mobility for active pursuits
- Item #SWLZ8BY
- Material
- 100% merino wool
- Insulation Weight
- 250gsm
- Fit
- slim
- Center Back Length
- [small] 24in
- Style
- crew
- Anti-Odor
- natural attribute of merino wool
- Claimed Weight
- 7oz
- Manufacturer Warranty
- 2 years
Reviews
Q&A
What do you think about this product?
Overall Rating
4.5 based on 28 ratings
Review Summary
Fits True To Size
Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.Customer Images
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Selecting an option will reload the available reviews on the pageMay 24, 2025
Warm and soft
- Familiarity:
- I've used it several times
- Size Bought:
- Large
Love it! So soft. Kept me super warm on my camping trip in the 20°F.
February 14, 2025
Warm warm and cozy
- Familiarity:
- I've used it several times
- Size Bought:
- S
- Height:
- 5' 6"
- Weight:
- 125
I love this base layer! It’s a nice medium weight. It feels like you have heavier protection than my lighter weight ones. I layer it with other clothing for skiing in temps in the teens in WA State and it keeps me warmer than some of my other lighter weight wool base layers. I also wear it for winter hiking with an added top and once again I’m warm. It’s also one of my go to tops for casual everyday wear since the design that I got is dressy enough to do so. I usually wear a XS but sized up to a small and it fits perfect.
February 6, 2025
Gotta love merino
- Familiarity:
- I've used it several times
- Size Bought:
- XL and I wear a size 12
Love!! Fun color and great functionality! Wore in 15 degree weather with a mid weight layer and jacket and it kept me warm while skiing.
January 12, 2025
Necessary buy
- Familiarity:
- I've used it several times
- Size Bought:
- Small
I purchased a top and bottom base layer for northern winter sports. The fit is perfect, the material is soft and comfortable, and the quality is worth the price.
January 5, 2025
Love it, super functional
- Familiarity:
- I've put it through the wringer
- Size Bought:
- S
Just used it for the last month, including a trip Maine hiking, snowshoeing, dogsledding, sledding etc. I love the fit that it isn’t baggy, didn’t make me sweat when layered, and doesn’t smell after multiple days of activity - it became my go-to base layer in Maine. I really enjoy the ease of care with washing and drying and that it doesn’t “look” like a base layer. I can wear it with jeans around town and it’s really cute. It fits true to size with a bit of stretch to flatter but not be tight. I’m 5’3”, pear shaped/athletic and 130 lbs.
January 4, 2025
Warm and cozy
- Familiarity:
- I've used it several times
- Size Bought:
- Medium
Perfect for layering
December 30, 2024
Warm, soft, and comfortable
- Familiarity:
- I've used it once or twice and have initial impressions
- Size Bought:
- Large
I got this to go with a pair of smartwool base layer bottoms. The top is very cozy and warm. Very happy with my purchase.
December 8, 2024
Perfect fit - size up!
- Familiarity:
- I've used it once or twice and have initial impressions
- Size Bought:
- L
- Height:
- 5' 8"
- Weight:
- 140
I am a 38C and usually wear an athletic bra that flattens my chest. I am usually a size M and sometimes a L. I sized up to a L and am happy with the fit. It's extra long in sleeves and length, but not baggy.
December 3, 2024
Color is off
I was excited to see the yellow color (marmalade heather), so even though I have lots of long underwear I bought this also. When I received it though the color is not yellow at all. It is solidly orange. So I am going to be returning the top along with the matching bottoms.
November 28, 2024
Comfortable
- Familiarity:
- I've used it several times
- Size Bought:
- Large
I’m on the heavier side (5’3 173) I ordered a large and it fits great. Warm but not suffocating hot. I plan to buy more. I wear it almost daily for bed.
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