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(79)79

Intraknit™ Thermal Merino Base Layer

Smartwool

Current Price $150.00
Color
Color: Nightfall Blue Deep Navy
Size
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$60 off your next purchase—ends Dec. 1! Plus, earn 10 points per dollar Oct. 21–25. Terms apply. Apply Now

Details & care

Stay warm on your next adventure in this slim-fitting base layer made from a body-mapped dimensional knit for breathability and freedom of movement. Seamlessly integrated mesh zones provide targeted ventilation, while ribbed elbows offer a durable feel. Soft merino wool–blend yarns provide reliable insulation and moisture-wicking comfort.

  • Crewneck
  • Long sleeves
  • Merino wool naturally resists odors and helps regulate body temperature for comfort
  • 100% merino wool
  • Machine wash, tumble dry
  • Imported
  • Item #11079316
  • Core Product ID 3333344Z2M

Size info

  • XS=0-2, S=4-6, M=8-10, L=12-14, XL=16-18.

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Free shipping. Free returns. All the time. Purchases made online can also be returned or exchanged at any Nordstrom store, free of charge. Read more about our shipping & returns policies.

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Smartwool

Smartwool was launched in 1994 in Steamboat Springs, Colorado, and initially specialized in performance socks made of Merino wool. Today the company continues to push the boundaries of Merino to create smarter, more capable outdoor apparel from head to toe. Built on the desire to be comfortable outside, Smartwool exists to help people play, live and laugh in the great outdoors.

Reviews

(79)794.5 out of 5
Write a Review
Fit: True to size

Most helpful positive review

Jan 21, 2026

Perfect snow gear

Lightweight and form fitting without being too tight. I love the design and color of the thermal under-over garment.
Pam1968
Verified purchase
1found this helpful

Most helpful critical review

Jan 26, 2022

Snags

Loved the color and appearance but after wearing it just one evening, the sleeve had two large snags that I had no idea where they came from. Just wore it a second time and again one large snag on the arm and two smaller ones in front. Would not recommend even at a lesser price.
Sue M.
Reposted from Smartwool
Smartwool response
Thank you for the feedback you gave through our website. It's important to hear how we're doing, and we take it very seriously. We want to provide the best products paired with the best service so you can keep going far and feeling good. We're sorry to hear you're experiencing some durability issues with our products and want to assure you this is out of the norm for Smartwool, as we make our products to last! Thankfully, all of our products are backed by our Go Far. Feel Good.:tm: Guarantee. You can find all the information about our Guarantee here: https://www.smartwool.com/discover/smartwool-guarantee.html We appreciate your note! Have a great day.

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5 stars76%
4 stars10%
3 stars6%
2 stars4%
1 star4%
Jan 21, 2026

Perfect snow gear

Lightweight and form fitting without being too tight. I love the design and color of the thermal under-over garment.
Verified purchase
Pam1968
Fit: True to size
Small
True to size
Large
Size purchased:
XL
Color:
Blue
Height:
5’5”
Weight:
170
1found this helpful
Aug 22, 2026

Great Top - Runs Small

[This review was collected as part of a promotion.] The garment itself is well made. It does feel soft & warm. However it does run small & I had to return it due to it being very tight on me. The return process was very easy & timely.
Reposted from Smartwool
Karen
July 5, 2026

Love 'em

I love this shirt. I had two others that I stained and needed to replace. Thank you.
Reposted from Smartwool
Lisa W.
Mar 20, 2026

My favorite baselayer.

The best base layer I have ever owned. I love how this keeps me super warm yet it is breathable and not tight at all. The material is soft and does not irritate, or squeeze my skin when I wear it all day. 10/10 comfy. I typically run cold, so having this in my wardrobe is an extra boost in cold weather. This is perfect for layering, and doesn't add much bulk. Highly recommend!
Reposted from Smartwool
Natalie
Mar 1, 2026

Does the Job & Looks Good Doing It!

This is a great base layer that is also attractive when all the top layers come off. Very comfortable & perfectly warm, I'm only sorry it took me so long to buy them! My only warning is that the sizing runs a bit small. I'm 5'4, 117 lbs. Using the fit guide, I ordered an XS and it was too tight under the arms and I couldn't even get the pants over my hips! The small fits perfectly.
Reposted from Smartwool
Lauren
Feb 24, 2026

Exceeds expectations

I live in a chilly area close to the coast and these are GREAT for staying warm! After I bought the first one, I promptly bought two more!
Reposted from Smartwool
Rebecca

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