On Body Image

Smartwool  Intraknit Thermal Merino Base Layer Bottoms - Women's

$130.00
Members get an est. $13.00 in rewards

Built to flex and follow you like a shadow, the women's Smartwool Intraknit Thermal Merino base layer bottoms are 3D knit for insulation, ventilation and flexibility for your high-intensity workouts.

Color: Black/White
please select a Size
Fits slightly large based on reviews
Quantity
Select size for delivery dates

Members get an estimated $13.00 (10%) back on this item as a part of your annual .

Members get an estimated $13.00 (10%) back on this item as a part of your annual .
To buy,  sign in as an REI Co-op Member or join now.
10% co-op member reward: $13$13 Member Reward
$30Member Bonus Card

This purchase pays for membership!

$13

10% Reward

on this and every eligible full-price item*

+

$30

Bonus Card

valid for 30 days after joining*

=

$43

Value

Start earning when you buy a $30 lifetime membership.

Keep shopping

Features

  • Made with Merino Sport yarn to offer the power of merino paired with the durability and fast dry times of polyester—perfect for skiing, running and high-intensity training
  • Seamlessly knit mesh ventilation is designed to keep you dry and comfortable
  • Featuring Intraknitâ„¢ technology offers insulation, articulation and ventilation and are designed to amplify movement and comfort during high-intensity activities
  • Smartwool slim fit is intended to follow the contours of the body
  • Fitted with a mid-rise waist
  • Size medium inseam is 31 in. (79 cm)

Imported.

View the Smartwool Intraknit Product LineView all Smartwool Women's Base Layer Bottoms

Technical Specs

Best Use

Multisport

Fabric

52% merino wool/45% polyester/2% elastane/1% polyamide

Moisture Wicking

Yes

Underwear Weight

Lightweight

Inseam (in.)

31 inches

Gender

Women's

Sustainability

Contains ZQ merino wool

Size Chart

Fits slightly large based on reviews

Runs smallRuns large
Smartwool Clothing - Women's
XSSMLXL1X2X3X4X
Numerical Size0 - 24 - 68 - 1012 - 1416 - 1816 - 1820 - 2224 - 2628 - 30
Chest32 - 3334 - 3536 - 3839 - 4041-4243 - 4547 - 4951 - 5355 - 57
Sleeve Length27 - 2828 - 2929 - 3030 - 3131 - 3231313233
Waist24 - 2526 - 2728 - 3031 - 3233 - 3439 - 4143 - 4647 - 5052 - 55
Hip35 - 3637 - 3839 - 4041 - 4243 - 4445 - 4749 - 5153 - 5557 - 59
Inseam29 - 3030 - 3131 - 3232 - 3333 - 3430 - 3230 - 3230 - 3230 - 32

Sizing Notes

Measurements are stated in inches.

Reviews
28 reviews with an average rating of 4.3 out of 5 stars

85% 17 of 20 reviewers recommended

Write a Review

Adding a review will require a valid email for verification

Average Overall Fit Rating

Runs SmallRuns Large

Customer Images

Most Helpful Favorable Review

17 people found this review helpful
5 reviews with an average rating of 5.0 out of 5 stars
1 year ago
Warm, Breathable & Soft!
I was back & forth between these & the other cheaper Smartwool base layers. Eventually I went into the store to try both. After reading all the reviews I thought for sure I was going to get the other base layer but it turned out the Intraknit was WAY softer. I am a bit of a oversensory human when it comes to itchy wool on my skin & these do not itch at all. I wear them outside in the Winter for 12+ hours on end & have worn them in negative temperatures. I am usually a Small all around but ended up getting a Small top & Medium bottoms to accommodate for my long legs + a little extra comfort while working outside. Very breathable, I hardly need to wash them! HIGHLY recommend.
Megs
Grand Rapids, MI

Most Helpful Critical Review

49 people found this review helpful
5 reviews with an average rating of 2.0 out of 5 stars
3 years ago
Tight!
I normally wear medium and recently ordered a different style of long underwear from REI in M and they were fine. But these (Smartwool Women's Intraknit Thermal Merino) feel like a size 4, with a ton of elastic, which I guess is supposed to make them wearable. I can get them on, but I would not be comfortable wearing them. Some people might not mind. Or you could try a size up. I'm hoping I can return them.
Bluejay
CA
Megs
Location:Grand Rapids, MI
Age:25–34
Weight:100–125 lbs.
Height:5'5"
Rated 5.0 out of 5 stars
1 year ago

Warm, Breathable & Soft!

I was back & forth between these & the other cheaper Smartwool base layers. Eventually I went into the store to try both. After reading all the reviews I thought for sure I was going to get the other base layer but it turned out the Intraknit was WAY softer. I am a bit of a oversensory human when it comes to itchy wool on my skin & these do not itch at all. I wear them outside in the Winter for 12+ hours on end & have worn them in negative temperatures. I am usually a Small all around but ended up getting a Small top & Medium bottoms to accommodate for my long legs + a little extra comfort while working outside. Very breathable, I hardly need to wash them! HIGHLY recommend.

Age:25–34
Weight:100–125 lbs.
Height:5'5"

Overall Fit Rating

Runs SmallRuns Large
Kara
Location:San Jose, CA
Age:25–34
Weight:125–150 lbs.
Height:5'6"
Rated 5.0 out of 5 stars
11 months ago

warm, comfortable, no vanity sizing

I got these bottoms and the matching shirt on the recommendation of my brother who swears by Smartwool. For context, my brother is the type to go hike up a mountain alone and sleep up there just to go backcountry skiing in the most desolate of places. My father lives in a colder area so finds the Smartwool products useful for outdoor activities also. I am a creature of comfort. Anyway, I felt very comfortable in the shirt and matching bottoms. I would say that this brand does not follow the vanity sizing of many women’s brands - I had to size up for tops and bottoms. (I am leaving the same review for both the top and the bottom.)

Age:25–34
Weight:125–150 lbs.
Height:5'6"

Overall Fit Rating

Runs SmallRuns Large
NHhikeski
Location:NH
Age:45–54
Weight:100–125 lbs.
Height:5'8"
Rated 5.0 out of 5 stars
1 year ago

My dream base layer pants

The greatest pants I own. I'm wearing them right now (in black) and came back to buy a second pair. Warm and comfy. Perfect base layer for skiing. I would wear these all winter long if I could. I did have to size up but I tried them on in store so no worries. I'm 5'8", 120 lb and a medium is great. So many base layer pants are too short, baggy in weird places, or just a funny fit on me but these are like a glove. I tried on about 8 different other models in multiple stores before finding these, so you know I'm picky.

Age:45–54
Weight:100–125 lbs.
Height:5'8"

Overall Fit Rating

Runs SmallRuns Large
Bluejay
Location:California
Age:55–64
Rated 2.0 out of 5 stars
3 years ago

Tight!

I normally wear medium and recently ordered a different style of long underwear from REI in M and they were fine. But these (Smartwool Women's Intraknit Thermal Merino) feel like a size 4, with a ton of elastic, which I guess is supposed to make them wearable. I can get them on, but I would not be comfortable wearing them. Some people might not mind. Or you could try a size up. I'm hoping I can return them.

Age:55–64
Chel
Rated 4.0 out of 5 stars
11 months ago

Go-to snow sport underwear

Favorite thermal leggings. Lasted 4 years before becoming thread bare in seat.

Overall Fit Rating

Runs SmallRuns Large
ski_all_day
Age:25–34
Rated 2.0 out of 5 stars
3 years ago

Horrible fit

The fit of these is extremely uncomfortable. They are surprisingly low waisted and tight - not what you would want for outdoor activities.

Age:25–34
nobadweather
Location:Minnesota
Age:45–54
Rated 5.0 out of 5 stars
1 year ago

cozy and fun to wear

…or so says my wife. Bought a small for her on reading other reviews (she’s usually and XS) and she’s very happy and warm - both out in the weather and at home.

Age:45–54
Tezza
Location:Michigan
Height:5'4"
Age:65–74
Weight:100–125 lbs.
Rated 5.0 out of 5 stars
11 months ago

Best base layer

I walk my dog every morning in Michigan, and it gets very cold in the winter. Even though these pants are expensive, they are worth every penny! I would highly recommend them.

Height:5'4"
Age:65–74
Weight:100–125 lbs.
Pam
Location:Hershey, PA
Age:45–54
Weight:125–150 lbs.
Height:5'7"
Rated 5.0 out of 5 stars
11 months ago

Worth every penny!

Unbelievably warm, yet light weight. Perfect under my snowboarding gear. Not too hot, not cold at all. Worth EVERY PENNY!

Age:45–54
Weight:125–150 lbs.
Height:5'7"

Overall Fit Rating

Runs SmallRuns Large
klabba
Location:DC
Age:35–44
Weight:125–150 lbs.
Height:5'5"
Rated 2.0 out of 5 stars
3 years ago

Very cute, but itchy

I really like the red color and design - it looks great! But so itchy, I can't imagine hiking or skiing in these.

Age:35–44
Weight:125–150 lbs.
Height:5'5"

Overall Fit Rating

Runs SmallRuns Large
1 - 10 of 28 Reviews

Questions & Answers

Loading Questions...