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Smartwool Long Sleeve Underwear

(36 products)

Products (36)

Sort: Best Match

Top Rated
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
$90.00
56 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women's
$83.93 - $120.00
26 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
SmartwoolIntraknit Thermal Merino Base Layer Quarter-Zip Top - Men's
$69.83 - $140.00
10 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's
$95.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's
$62.93 - $90.00
105 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Women's
$95.00
1 reviews with an average rating of 5.0 out of 5 stars
Size Type:
Regular
SmartwoolIntraknit Active Long-Sleeve Base Layer Top - Women's
$110.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Staff Pick
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$56.83 - $115.00
1505 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolClassic Thermal Merino Colorblock Crew Base Layer Top - Men's
$59.83 - $120.00
1 reviews with an average rating of 5.0 out of 5 stars
Size Type:
Regular
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$56.83 - $115.00
1151 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
$59.83 - $120.00
15 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$64.83 - $130.00
189 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's
$64.83 - $130.00
188 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$86.73
Save 24%
compared to $115.00
Save up to 30% extra on your REI Outlet purchase
365 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
New arrival
SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Women's
$89.73
Save 25%
compared to $120.00
Save up to 30% extra on your REI Outlet purchase
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$86.73
Save 24%
compared to $115.00
Save up to 30% extra on your REI Outlet purchase
273 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
SmartwoolClassic Thermal Merino Colorblock Quarter-Zip Base Layer Top - Women's
$86.93
Save 30%
compared to $125.00
0 reviews
Size Type:
Regular
SmartwoolClassic Thermal Merino Base Layer Half-Zip Hoodie - Women's
$71.83
Save 50%
compared to $145.00
3 reviews with an average rating of 3.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
SmartwoolThermal Merino Base Layer Hoodie - Men's
$145.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
SmartwoolIntraknit Active Base Layer Top - Men's
$110.00
1 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
SmartwoolIntraknit Thermal Merino Pattern Crew Base Layer Top - Women's
$90.93
Save 30%
compared to $130.00
82 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's
$97.73
Save 24%
compared to $130.00
Save up to 30% extra on your REI Outlet purchase
119 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
SmartwoolClassic Thermal Merino Lettuce Edge Crew Base Layer Top - Women's
$82.73
Save 28%
compared to $115.00
Save up to 30% extra on your REI Outlet purchase
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
SmartwoolIntraknit Thermal Merino Pattern Crew Base Layer Top - Men's
$90.73
Save 30%
compared to $130.00
Save up to 30% extra on your REI Outlet purchase
2 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
SmartwoolClassic All Season Merino Long-Sleeve Base Layer Top - Men's
$67.73
Save 24%
compared to $90.00
Save up to 30% extra on your REI Outlet purchase
56 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
New arrival
SmartwoolIntraknit Thermal Max Merino Base Layer Pattern Hoodie - Women's
$123.73
Save 25%
compared to $165.00
Save up to 30% extra on your REI Outlet purchase
0 reviews
Size Type:
Regular
REI OUTLET
SmartwoolIntraknit Active Base Layer Crew Shirt - Men's
$81.73
Save 25%
compared to $110.00
Save up to 30% extra on your REI Outlet purchase
1 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Big, Regular
REI OUTLET
SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'
$48.73
Save 25%
compared to $65.00
Save up to 30% extra on your REI Outlet purchase
4 reviews with an average rating of 3.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Men's
$89.73
Save 25%
compared to $120.00
Save up to 30% extra on your REI Outlet purchase
15 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
New arrival
SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Kids'
$52.73
Save 24%
compared to $70.00
Save up to 30% extra on your REI Outlet purchase
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET

1–30 of 36 products

Sort: Best Match

Related Expert Advice articles

What material is best?

Wool is moisture-wicking and odor-resistant, while synthetic fabrics are more durable and less expensive.

Match the temp to the trek

Lightweight layers are best for moderate to cool temperatures. Midweight layers are best for cold temperatures. Heavyweight layers are best for below-freezing temperatures.

Find your fit

To be able to wick sweat efficiently, your next-to-skin layer needs to actually be next to your skin. A comfortably snug fit everywhere is your goal.

Read full article: How to Choose Base Layers

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