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Base Layers and Underwear

The best base layers and underwear, reviewed and curated by the Trailspace community. The latest review was added on October 8, 2020. Stores' prices and availability are updated daily.

user rating: 4.5 of 5 (9)
ExOfficio Give-N-Go Boxer Brief Boxer/Brief/Bikini
$16 - $21
user rating: 5 of 5 (2)
Icebreaker Oasis Long Sleeve Crewe Top
$9 - $66
user rating: 5 of 5 (2)
Patagonia R1 Pants Bottom / Fleece
$119
user rating: 5 of 5 (2)
Smartwool Midweight Zip T Top
$11
user rating: 5 of 5 (2)
Icebreaker Everyday Long Sleeve Crewe Top
$40
user rating: 5 of 5 (1)
Fjallraven Bergtagen Longjohns Bottom
$140
user rating: 5 of 5 (1)
Smartwool NTS Mid 250 Bottom Bottom
$50 - $69
user rating: 5 of 5 (1)
Fjallraven Bergtagen Woolmesh Sweater Top
$160
user rating: 5 of 5 (1)
Patagonia Capilene 3 Midweight Bottoms Bottom
$35 - $59
user rating: 4.5 of 5 (1)
Outdoor Research Enigma Boxer Briefs Boxer/Brief/Bikini
$24 - $34
user rating: 4.5 of 5 (1)
Helly Hansen HH Lifa Merino Pant Bottom
$95
user rating: 4.5 of 5 (1)
Patagonia Capilene Air Bottoms Bottom
$48 - $129
user rating: 4.5 of 5 (1)
Outdoor Research Enigma Bottoms Bottom
$51 - $69
user rating: 4.5 of 5 (1)
Outdoor Research Enigma Half Zip Top
$59 - $79
user rating: 4.5 of 5 (1)
Black Diamond Solution 150 Merino Base 3/4 Bottom
$95
user rating: 4.5 of 5 (1)
Black Diamond Solution 150 Merino Base Crew Top
$119 - $120
 
user rating: 4.5 of 5 (1)
Voormi River Run Hoodie Top
$129
user rating: 4.5 of 5 (1)
Craft Active Extreme 2.0 CN LS Top Top
$51
user rating: 4.5 of 5 (1)
ExOfficio Give-N-Go Sport Mesh Brief Boxer/Brief/Bikini
$14
user rating: 4.5 of 5 (1)
Helly Hansen HH Lifa Merino 1/2 Zip Top
$63 - $73
user rating: 4.5 of 5 (1)
Kari Traa Rose Long Sleeve Top
$64 - $99
user rating: 4.5 of 5 (1)
Icebreaker Anatomica Brief Boxer/Brief/Bikini
$30 - $40
user rating: 4.5 of 5 (1)
Smartwool Merino 150 Pocket Tee Top / Short Sleeve Performance
$43 - $85
user rating: 4.5 of 5 (1)
Patagonia Capilene Air Hoody Top
$149
user rating: 4.5 of 5 (1)
Kari Traa Rose Pant Bottom
$60 - $100
user rating: 4.5 of 5 (1)
Smartwool Merino Sport 150 Brief Boxer/Brief/Bikini
$18 - $25
user rating: 4 of 5 (2)
Patagonia Capilene Air Crew Top
$90 - $129
user rating: 4 of 5 (2)
Outdoor Research ActiveIce Sun Sleeves Arm/Leg Sleeve
$10 - $29
user rating: 4 of 5 (1)
SportHill Northwind Unders Boxer/Brief/Bikini
$50
user rating: 4 of 5 (1)
Smartwool Merino Sport 150 Hidden Pocket Tech Tee Short Sleeve Performance Top / Top
$42 - $65
user rating: 4 of 5 (1)
Smartwool Intraknit Merino 250 Thermal 1/4 Zip Top
$105 - $150
user rating: 4 of 5 (1)
ExOfficio Give-N-Go Lacy Full Cut Brief Boxer/Brief/Bikini
$18
user rating: 3.5 of 5 (2)
ExOfficio Give-N-Go Boxer Boxer/Brief/Bikini
$16 - $26
user rating: 3.5 of 5 (1)
Smartwool Intraknit Merino 250 Thermal Bottom Bottom
$85 - $130
user rating: 3.5 of 5 (1)
Outdoor Research Alpine Onset Bottoms Bottom
$62
user rating: 3 of 5 (2)
Patagonia Capilene Thermal Weight Zip-Neck Top
$80 - $99
ExOfficio Sol Cool Boxer Brief Boxer/Brief/Bikini
$14 - $33
ExOfficio Give-N-Go Lacy Bikini Boxer/Brief/Bikini
$10 - $16
Airblaster Ninja Suit One-Piece Base Layer
$72 - $114
user rating: 2 of 5 (1)
Terramar Silk Pant Bottom
$39 - $55
user rating: 5 of 5 (6)
Patagonia Capilene 2 Lightweight Zip-Neck Top
user rating: 5 of 5 (3)
Icebreaker Bodyfit 150 Long Sleeve Crewe Top
user rating: 5 of 5 (2)
Icebreaker 260 Midweight Tech Top Top
$110 MSRP
user rating: 5 of 5 (2)
Marmot Lightweight Crew LS Top
$45 MSRP
user rating: 5 of 5 (2)
Marmot Midweight Bottom Bottom
$50 MSRP
user rating: 5 of 5 (2)
Patagonia Merino 2 Lightweight Crew Top
$70 MSRP
user rating: 5 of 5 (2)
Patagonia Capilene 4 Expedition Weight Zip-Neck Top
user rating: 5 of 5 (2)
Stoic Alpine Merino 150 Crew - Long-Sleeve Top
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Recent Base Layer Reviews

rated 5 of 5 stars
Bight Gear Solstice Graphene Hoody

Very protective, good fit, light weight, and reasonably priced. This is my second sun hoody after the Black Diamond Alpenglow, which I liked. The Bight Solstice Hoody has a better fit for me (not quite as loose) and the fabric is lighter in weight and has a nicer hand. In contrast to the Alpenglow, it has thumb holes which provide a bit more sun protection for the back of the hands without interfering with dexterity, plus it's a bit less expensive ($69) than the Alpenglow ($85 retail). I treated… Full review

rated 4.5 of 5 stars
Voormi River Run Hoodie

Who needs another baselayer or hoodie? Apparently I do. After three months of use the Voormi River Run Hoodie has become a standout in my baselayer collection. It's a versatile, lightweight, wool-polyester top that is comfortable, well-constructed, good-looking, and odor-free. While it's a minimalist design, it performs in a wide range of temps and terrain—from summer hiking to fall camping, and I'm planning to keep it in rotation for winter runs and skis. Women's Voormi River Run Hoodie I have… Full review

rated 1 of 5 stars
Patagonia Capilene Thermal Weight Zip-Neck

Uncomfortable fabric, poor fit. Worst Patagonia purchase in 35 years. Worst Patagonia item I have ever purchased. Fabric is uncomfortable on the skin. This weight is what came up when I wanted to replace my expedition weight zip top. Ridiculous. This is flimsy, textured on the inner surface. Shoulder area and neck fit is loose and loaded with excess fabric. If I could give it a negative star rating, I would.  Full review

rated 4.5 of 5 stars
Smartwool Merino 150 Pocket Tee

The Smartwool Merino 150 Pocket Tee is an active wear, base layer made up of 87% merino wool and 13% polyester. The high wool content maximizes one of nature's greatest insulator's ability to regulate temperature, ward off the multi-day stink, and manage moisture, while the polyester content adds durability and comfort. A lightweight wool tee allows for an endless amount of uses—from a thin sun shirt on hot summer days, to an excellent next to skin layer as part of a clothing system in winter. Full review

rated 4.5 of 5 stars
Appalachian Gear Company All-Paca Crew

The All-Paca Crew is a lightweight, medium thickness base-layer suitable for active wear or just lounging around the house during a lock-down. It's made from 100 percent Alpaca fiber. It fills my niche as a three-season hiking/sleep layer, to be paired with a t-shirt on cold mornings and with a shell when the wind or rain begins to cut. It offers a good warmth-to-weight ratio, breathability, and also a hefty resistance to odor. It closely matches the performance of similar technical base-layers… Full review

rated 4 of 5 stars
Smartwool Merino Sport 150 Hidden Pocket Tech Tee

The Smartwool Merino Sport 150 Hidden Pocket Tech Tee is a lightweight tee-shirt, made from a comfortably soft blend of merino wool and polyester (56% merino/44% polyester). This combination makes for a shirt that breathes well, stays cool, dries quickly, and doesn’t stink after a day of hiking. An ideal shirt for warm weather adventures. Unfortunately, the hidden pocket isn't very practical. Conditions: I’ve worn the Smartwool Merino Sport 150 Hidden Pocket Tech Tee regularly for two months,… Full review

rated 4.5 of 5 stars
The Elixir UV Arm Sleeves

The Elixir UV Arm Sleeves provide inexpensive, lightweight protection from sun and bugs, while keeping the wearer cool and comfortable. Worn on a 7-day hike with temperatures reaching the upper-80s, this reviewer was extremely satisfied with the sleeves' performance. The UV Arm Sleeves was an impulse buy, as I used an online gift card given to me at Christmas. Costing $13.99 for a four-pack, I thought of numerous activities this fair-skinned Scot-Irishman might use them for. I started off very skeptical… Full review

rated 3.5 of 5 stars
Smartwool Intraknit Merino 250 Thermal Bottom

The Smartwool Intraknit Merino 250 Thermal Bottom combines 100% Merino wool with an innovative construction that uses 3D modeling to create a warm, comfortable base layer. Made for active use it moves with a body in motion, gentle hiking or hard driven climb alike. Feels pretty good in a winter camp or home on the couch as well. Smartwool takes a technical leap forward with their newly designed Intraknit Merino 250 Thermal Bottom and I've had the pleasure of extensively testing it over the last… Full review

rated 4 of 5 stars
Smartwool Intraknit Merino 250 Thermal 1/4 Zip

The Smartwool Intraknit Merino 250 Thermal Quarter Zip brings 100% Merino wool in a comfortable and warm weave. This shirt works as a base, mid, outer and only layer depending on conditions, activity and the wearer's temperament. Versatile enough to handle a wide variety of cold weather activities. Smartwool takes a technical leap forward with their newly designed Intraknit Merino 250 Thermal 1/4 Zip and I've had the pleasure of extensively testing it over the last four months. Along with their… Full review