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Long Sleeve Underwear

(186 products)

Products (186)

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REI Co-opSilk Long Underwear Crew Shirt - Men's

$54.95
58 reviews with an average rating of 4.2 out of 5 stars
New arrival
NRSExpedition Weight Union Suit - Men's

$159.95
1 reviews with an average rating of 5.0 out of 5 stars
Colors
Top Rated
REI Co-opMerino Midweight Base Layer Top - Kids'

$49.95
15 reviews with an average rating of 4.7 out of 5 stars
Colors
Top Rated
SmartwoolIntraknit Thermal Merino Colorblock Crew Base Layer Top - Men's

$125.00
6 reviews with an average rating of 4.7 out of 5 stars
New arrival
NRSH2Core Lightweight Union Suit - Men's

$109.95
2 reviews with an average rating of 3.0 out of 5 stars
Colors
REI Outlet
ObermeyerDiscover Crew Base Layer Top - Women's

$41.73 compared to $69.00
You save 39%

5 reviews with an average rating of 5.0 out of 5 stars
Colors
Top Rated
The North FaceWaffle Base Layer One-Piece - Infants'

$45.00
5 reviews with an average rating of 5.0 out of 5 stars
Colors

REI Co-opMidweight Crew Long Underwear Top - Toddlers'

$24.95
3 reviews with an average rating of 5.0 out of 5 stars
Top Rated
SmartwoolMerino 250 Base Layer Crew Top - Women's Plus Sizes

$110.00
6 reviews with an average rating of 5.0 out of 5 stars
Colors

REI Co-opLightweight Crew Long Underwear Top - Kids'

$29.95
3 reviews with an average rating of 5.0 out of 5 stars
Colors
REI Outlet
CraftCORE Wool Mix Base Layer Set - Men's

$104.73 compared to $139.95
You save 25%

0 reviews
REI Outlet
CraftCore Dry Base-Layer Set - Men's

$56.73 compared to $74.95
You save 24%

0 reviews
Colors

REI Co-opMidweight Crew Long Underwear Top - Kids'

$34.95
10 reviews with an average rating of 3.8 out of 5 stars
Top Rated
Icebreaker200 Oasis Long-Sleeve Crewe Ski Tracks Base Layer Top - Women's

$79.93 compared to $115.00
You save 30%

11 reviews with an average rating of 4.7 out of 5 stars
Colors
Top Rated
Icebreaker200 Oasis Crewe Long-Sleeve Base Layer Top - Kids'

$41.93 compared to $60.00
You save 30%

116 reviews with an average rating of 4.8 out of 5 stars
Colors

REI Co-opLightweight Crew Long Underwear Top - Infants'/Toddlers'

$19.95
2 reviews with an average rating of 5.0 out of 5 stars
SmartwoolClassic Thermal Merino Base Layer Half-Zip Hoodie - Women's

$140.00
0 reviews
Icebreaker200 Oasis Long-Sleeve Crewe Lichen Base Layer Top - Women's

$79.93 compared to $115.00
You save 30%

3 reviews with an average rating of 4.3 out of 5 stars
Helly HansenLifa Merino Midweight Base Layer Crew Top - Women's

$100.00
0 reviews
SmartwoolIntraknit Thermal Merino Half-Zip Base Layer Hoodie - Men's

$155.00
3 reviews with an average rating of 3.7 out of 5 stars
Helly HansenLIFA Merino Midweight Base Layer Hoodie - Women's

$120.00
1 reviews with an average rating of 5.0 out of 5 stars
Helly HansenLifa Merino Midweight Base Layer Half-Zip Top - Women's

$110.00
0 reviews
New arrival
Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Top - Men's

$125.00
0 reviews
NRSLightweight Union Suit - Women's

$109.95
0 reviews
NRSExpedition Union Suit - Women's

$159.95
0 reviews
Wild RyeOlivia Onesie - Women's

$229.00
0 reviews
Helly HansenLIFA Merino Midweight Base Layer Hoodie - Men's

$120.00
0 reviews
Colors

ObermeyerClara Quarter-Zip Base Layer Top - Girls'

$79.50
0 reviews
New arrival
Kari TraaLam Long-Sleeve Base Layer Top - Women's

$80.00
0 reviews
Colors
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Top - Kids'

$65.93 compared to $95.00
You save 30%

18 reviews with an average rating of 4.8 out of 5 stars

Get the latest deals, news, & more from REI Co-op!

Long Sleeve Underwear

REI Co-opSilk Long Underwear Crew Shirt - Men's

NRSExpedition Weight Union Suit - Men's

REI Co-opMerino Midweight Base Layer Top - Kids'

SmartwoolIntraknit Thermal Merino Colorblock Crew Base Layer Top - Men's

NRSH2Core Lightweight Union Suit - Men's

ObermeyerDiscover Crew Base Layer Top - Women's

The North FaceWaffle Base Layer One-Piece - Infants'

REI Co-opMidweight Crew Long Underwear Top - Toddlers'

SmartwoolMerino 250 Base Layer Crew Top - Women's Plus Sizes

REI Co-opLightweight Crew Long Underwear Top - Kids'

CraftCORE Wool Mix Base Layer Set - Men's

CraftCore Dry Base-Layer Set - Men's

REI Co-opMidweight Crew Long Underwear Top - Kids'

Icebreaker200 Oasis Long-Sleeve Crewe Ski Tracks Base Layer Top - Women's

Icebreaker200 Oasis Crewe Long-Sleeve Base Layer Top - Kids'

REI Co-opLightweight Crew Long Underwear Top - Infants'/Toddlers'

SmartwoolClassic Thermal Merino Base Layer Half-Zip Hoodie - Women's

Icebreaker200 Oasis Long-Sleeve Crewe Lichen Base Layer Top - Women's

Helly HansenLifa Merino Midweight Base Layer Crew Top - Women's

SmartwoolIntraknit Thermal Merino Half-Zip Base Layer Hoodie - Men's

Helly HansenLIFA Merino Midweight Base Layer Hoodie - Women's

Helly HansenLifa Merino Midweight Base Layer Half-Zip Top - Women's

Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Top - Men's

NRSLightweight Union Suit - Women's

NRSExpedition Union Suit - Women's

Wild RyeOlivia Onesie - Women's

Helly HansenLIFA Merino Midweight Base Layer Hoodie - Men's

ObermeyerClara Quarter-Zip Base Layer Top - Girls'

Kari TraaLam Long-Sleeve Base Layer Top - Women's

IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Top - Kids'

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REI Co-opSilk Long Underwear Crew Shirt - Men's

NRSExpedition Weight Union Suit - Men's

REI Co-opMerino Midweight Base Layer Top - Kids'

SmartwoolIntraknit Thermal Merino Colorblock Crew Base Layer Top - Men's

NRSH2Core Lightweight Union Suit - Men's

ObermeyerDiscover Crew Base Layer Top - Women's

The North FaceWaffle Base Layer One-Piece - Infants'

REI Co-opMidweight Crew Long Underwear Top - Toddlers'

SmartwoolMerino 250 Base Layer Crew Top - Women's Plus Sizes

REI Co-opLightweight Crew Long Underwear Top - Kids'

CraftCORE Wool Mix Base Layer Set - Men's

CraftCore Dry Base-Layer Set - Men's

REI Co-opMidweight Crew Long Underwear Top - Kids'

Icebreaker200 Oasis Long-Sleeve Crewe Ski Tracks Base Layer Top - Women's

Icebreaker200 Oasis Crewe Long-Sleeve Base Layer Top - Kids'

REI Co-opLightweight Crew Long Underwear Top - Infants'/Toddlers'

SmartwoolClassic Thermal Merino Base Layer Half-Zip Hoodie - Women's

Icebreaker200 Oasis Long-Sleeve Crewe Lichen Base Layer Top - Women's

Helly HansenLifa Merino Midweight Base Layer Crew Top - Women's

SmartwoolIntraknit Thermal Merino Half-Zip Base Layer Hoodie - Men's

Helly HansenLIFA Merino Midweight Base Layer Hoodie - Women's

Helly HansenLifa Merino Midweight Base Layer Half-Zip Top - Women's

Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Top - Men's

NRSLightweight Union Suit - Women's

NRSExpedition Union Suit - Women's

Wild RyeOlivia Onesie - Women's

Helly HansenLIFA Merino Midweight Base Layer Hoodie - Men's

ObermeyerClara Quarter-Zip Base Layer Top - Girls'

Kari TraaLam Long-Sleeve Base Layer Top - Women's

IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Top - Kids'

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