Women's Aspect Midweight Merino Wool Long Sleeve Shirt



You can't go wrong with Wirecutter's top pick for the best thermal underwear. Our Aspect Base Layer Long Sleeve Shirt is a "city-to-trail shirt" and Wirecutter's "most versatile pick." They capture what we really love about this base layer top—it's endlessly versatile and the perfect companion no matter where the day takes you. It's soft and cozy against your skin and it keeps you warm, dry and comfortable. Plus it features industry-leading durability thanks to our (m)Force Technology. It has a slightly longer cut so it stays tucked in when skiing or snowboarding, and it has discreet thumb holes. Pair it with our Aspect High Rise Bottoms.
"It's a versatile layer that handled the transition well from walking around in 30-degree-Fahrenheit temperatures to a hot and crowded house party.” - WIRED Magazine
- Versatile midweight base layer that's warm but not too warm
- Natural, sustainable Merino wool reinforced with (m)Force Technology for increased durability, dry times and recovery
- Odor resistant, moisture wicking, sun protective, breathable and temperature regulating
- Backpack-friendly raglan construction
- Discreet thumb holes that keep sleeves in place when needed
- Long cut that works great for layering and stays tucked in
- Low-profile flatlock seams
- Printed neck label & removable care label
- 84% Merino wool, 16% nylon
- Soft 180 GSM (m)Force Merino 18.5M wool
Care: Machine wash on cold, hang dry, do not bleach or dry clean, iron on low wool setting. Learn more.
Amber (in Black) is 5'7" wearing a Small.
- Fits as a base layer close to your body
- Extra length for more coverage
Sleeve Length (from collar to end of the sleeve)
- XS - 28"
- S - 29"
- M - 30"
- L - 31"
- XL - 32"
Not sure what size to order? See our size guide.
Women's Size Guide
*NOTE: Our spring/summer 2025 and fall/winter 2025 collections have new sizing for women. Each product page has the correct size chart linked from it. Older products using the previous women's sizing have a note on the product page.
Finding the right size. The measurements below refer to body size, not garment dimensions (with the exception of the specs marked actual garment measurements). If you're between sizes, either size down for a tighter fit or up for a looser fit.
Our Size | Numeric Size | Chest | Waist | Hip |
0 |
32.5" |
25.5" |
35" | |
XS | 2 |
33.5" |
26.5" |
36" |
4 | 34.5" |
27.5" |
37" | |
S | 6 | 35.5" |
28.5" |
38" |
8 | 36.5" | 29.5" | 39" | |
M | 10 | 37.5" | 30.5" | 40" |
12 | 39" | 32" | 41.5" | |
L | 14 | 40.5" | 33.5" | 43" |
16 | 42" | 35" | 44.5" | |
XL | 18 | 43.5" | 36.5" | 46" |
Looking for the inseam length? Refer to the product page to find out.
HOW TO MEASURE:
- Chest — Measure under your arms around the fullest part of your chest.
- Waist — Measure around your natural waistline.
- Hip — Measure around the fullest part of your hips.
- Sleeve Length — measured from the collar (at the highest shoulder point) to the sleeve opening
- Body Length — measured from the highest shoulder point (at collar/shoulder seam) to the hem
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