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Base Layer Tops

(267 products)

Products (267)

Sort: Best Match

Top Rated
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
$27.93 - $39.95
16 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
$54.95
170 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
REI Co-opMidweight Long-Sleeve Base Layer Top - Women's
$54.95
277 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$115.00
1500 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
$79.95
189 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$115.00
1160 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
$66.93 - $90.00
66 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's
$90.00
123 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
REI Co-opMidweight Base Layer Half-Zip Top - Men's
$59.95
156 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
REI Co-opMidweight Base Layer Half-Zip Top - Women's
$59.95
162 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Women's
$99.95
28 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
$120.00
26 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$105.00
164 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
tasc PerformanceElevation Merino T-Shirt - Men's
$34.73 - $54.73
Save 30% - 56%
compared to $79.00
41 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women's
$27.93 - $39.95
26 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women's
$120.00
36 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
REI Co-opLightweight Half-Zip Base Layer Top - Men's
$29.93 - $44.95
10 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opMidweight Base Layer Crew Top - Kids'
$34.95
6 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
Arc'teryxRho LT Base Layer Hoody - Men's
$120.00
47 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
$105.00
155 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
REI Co-opLightweight Half-Zip Base Layer Top - Women's
$29.93 - $44.95
7 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's
$104.95
15 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opLightweight Crew Base Layer Top - Men's
$19.93 - $29.95
20 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's
$99.95
24 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
tasc PerformanceElevation Merino T-Shirt - Women's
$54.73
Save 30%
compared to $79.00
79 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
$89.95
110 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Women's
$29.83 - $89.00
46 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men's
$125.00
62 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Free CountryForce Grid Fleece Base Layer Top - Women's
$34.73
Save 36%
compared to $55.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI OUTLET
Arc'teryxRho SV Zip-Neck Base Layer Top - Men's
$140.00
0 reviews
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's Tall Sizes
$79.95
8 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Tall, Big
Helly HansenLIFA Merino Midweight 2-In-1 Base Layer Hoodie - Women's
$86.73
Save 27%
compared to $120.00
3 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Men's
$89.00
85 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
Arc'teryxRho LT Crew Neck Base Layer Top - Men's
$100.00
34 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
SmartwoolIntraknit Active Base Layer Crew Shirt - Women's
$79.73
Save 27%
compared to $110.00
3 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's
$79.95
203 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Terramar2.0 Cloud Nine Half-Zip Base Layer Top - Women's
$34.73
Save 30%
compared to $50.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Men's
$99.73
Save 26%
compared to $135.00
39 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
REI OUTLET
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Women's
$69.73
Save 26%
compared to $95.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Top Rated
REI Co-opMidweight Base Layer Crew Top - Toddlers'
$24.95
15 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
Arc'teryxRho Hoody Base Layer Top - Women's
$120.00 - $140.00
37 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
Arc'teryxRho Merino Wool Crew Neck Base Layer Top - Men's
$120.00
32 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
New arrival
IcebreakerSiren Long-Sleeve Sweetheart Base Layer Shirt - Women's
$62.73
Save 26%
compared to $85.00
25 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Top Rated
Arc'teryxRho LT Zip-Neck Base Layer Top - Men's
$120.00
97 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
Top Rated
Helly HansenLIFA Merino Midweight Half-Zip Base Layer Top - Men's
$79.73
Save 27%
compared to $110.00
5 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women's
$104.95
22 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Top Rated
Arc'teryxRho Zip-Neck Base Layer Top - Women's
$120.00
38 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
$78.73
Save 25%
compared to $105.00
152 reviews with an average rating of 4.7 out of 5 stars
Size Type:
Plus, Regular
REI OUTLET
Free CountryForce Grid Fleece Base Layer Top - Men's
$29.73
Save 33%
compared to $45.00
4 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
SmartwoolClassic All-Season Merino T-Shirt - Men's
$80.00
88 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Helly HansenMerino Wool Base Layer Set - Kids'
$75.73
Save 36%
compared to $120.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$78.73
Save 25%
compared to $105.00
67 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
SmartwoolClassic All-Season Merino T-Shirt - Women's
$80.00
91 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
REI Co-opMerino Midweight Base Layer Crew Top - Kids'
$49.95
27 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$130.00
189 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
REI Co-opLightweight Crew Base Layer Top - Women's
$19.93 - $29.95
15 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
SmartwoolThermal Merino Rib Turtleneck Base Layer Top - Women's
$130.00
4 reviews with an average rating of 3.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI Co-opMerino 185 Base Layer Top - Men's
$69.95
54 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
REI Co-opLightweight Crew Base Layer Top - Toddlers'
$19.95
13 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
Black DiamondSolution 150 Merino Base Layer Crew Top - Women's
$99.73
Save 26%
compared to $135.00
21 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's
$99.00
27 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
$81.73
Save 28%
compared to $115.00
377 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's
$130.00
189 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men's
$99.00
64 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Terramar3.0 Thermawool Crew Base Layer Top - Women's
$49.73 - $52.73
Save 24% - 28%
compared to $70.00
1 reviews with an average rating of 3.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Half-Zip Thermal Base Layer Top - Women's
$84.73
Save 26%
compared to $115.00
34 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
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 Thermal Merino Crew Base Layer Top - Women's
$96.73
Save 25%
compared to $130.00
120 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Free CountryCloud Knit Crewneck Base Layer Top - Men's
$26.73
Save 33%
compared to $40.00
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Men's
$89.73
Save 25%
compared to $120.00
26 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
PatagoniaCapilene Thermal Weight Long Underwear Crew Top - Men's
$99.00
10 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Arc'teryxRho Merino Wool Zip-Neck Base Layer Top - Men's
$140.00
11 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's
$95.00
4 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$92.73
Save 28%
compared to $130.00
9 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
REI Co-opLightweight Base Layer Crew Top - Kids'
$29.95
13 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Hot ChillysOriginals Solid Base Layer Crew - Kids'
$34.73
Save 26%
compared to $47.50
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
Helly HansenLifa Merino Midweight Half-Zip Base Layer Top - Men's
$110.00 - $115.00
5 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's Plus Sizes
$79.95
29 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's
$89.95
103 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI Co-opMerino 185 Base Layer Top - Women's
$69.95
53 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's Tall Sizes
$89.95
13 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Tall, Big
SaxxRoast Master Midweight Long-Sleeve Crew Base Layer Top - Men's
$47.73
Save 36%
compared to $75.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Kari TraaVilma Half-Zip Base Layer Top - Women's
$74.73
Save 25%
compared to $100.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
SmartwoolIntraknit Thermal Merino Base Layer Quarter-Zip Top - Men's
$140.00
11 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolIntraknit Thermal Merino Colorblock Quarter-Zip Base Layer Top - Women's
$140.00
3 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
SmartwoolIntraknit Thermal Max Merino Base Layer Pattern Hoodie - Women's
$114.73
Save 30%
compared to $165.00
0 reviews
Size Type:
Regular
REI OUTLET
CraftCORE Dry Active Comfort Base Layer Top - Women's
$39.73
Save 38%
compared to $64.95
4 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Helly HansenLIFA Merino Midweight Crew Base Layer Top - Women's
$69.73
Save 30%
compared to $100.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$85.73
Save 25%
compared to $115.00
279 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
SmartwoolClassic Thermal Merino Base Layer Quarter-Zip Top - Kids'
$70.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular

1–90 of 267 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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