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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 May 19, 2021. Stores' prices and availability are updated daily.

user rating: 4.5 of 5 (9)
ExOfficio Give-N-Go Boxer Brief Boxer/Brief/Bikini
$18 - $64
user rating: 5 of 5 (2)
Helly Hansen HH LIFA Stripe Crew Top
$28 - $40
user rating: 5 of 5 (2)
Patagonia R1 Pants Bottom / Fleece
$119
user rating: 5 of 5 (1)
Fjallraven Bergtagen Longjohns Bottom
$140
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
$25
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
$44 - $46
user rating: 4.5 of 5 (1)
Outdoor Research Enigma Half Zip Top
$59 - $62
user rating: 4.5 of 5 (1)
FORLOH Deep Space Half Zip Long Sleeve Top Top
$129
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
$90 - $120
 
user rating: 4.5 of 5 (1)
Voormi River Run Hoodie Top
$129
user rating: 4.5 of 5 (1)
ExOfficio Give-N-Go Sport Mesh Brief Boxer/Brief/Bikini
$16 - $19
user rating: 4.5 of 5 (1)
Kari Traa Rose Long Sleeve Top
$70 - $99
user rating: 4.5 of 5 (1)
Icebreaker Anatomica Brief Boxer/Brief/Bikini
$30 - $39
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
$55 - $78
user rating: 4.5 of 5 (1)
Smartwool Merino Sport 150 Brief Boxer/Brief/Bikini
$19 - $25
user rating: 4 of 5 (2)
Patagonia Capilene Air Crew Top
$129
user rating: 4 of 5 (2)
Outdoor Research ActiveIce Sun Sleeves Arm/Leg Sleeve
$29
user rating: 4 of 5 (1)
Smartwool Merino Sport 150 Hidden Pocket Tech Tee Short Sleeve Performance Top / Top
$65
user rating: 4 of 5 (1)
Smartwool Intraknit Merino 250 Thermal 1/4 Zip Top
$70 - $150
user rating: 3.5 of 5 (2)
ExOfficio Give-N-Go Boxer Boxer/Brief/Bikini
$18 - $64
user rating: 3.5 of 5 (1)
Smartwool Intraknit Merino 250 Thermal Bottom Bottom
$84 - $130
user rating: 3.5 of 5 (1)
Outdoor Research Alpine Onset Bottoms Bottom
$62
user rating: 3.5 of 5 (1)
Toad&Co Pacer Slim Long Sleeve Quarter Zip Top
$75
user rating: 3 of 5 (2)
Patagonia Capilene Thermal Weight Zip-Neck Top
$99
ExOfficio Sol Cool Boxer Brief Boxer/Brief/Bikini
$27 - $28
Airblaster Ninja Suit One-Piece Base Layer
$60 - $119
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)
Icebreaker Oasis Long Sleeve Crewe Top
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)
Smartwool Midweight Zip T Top
$90 MSRP
user rating: 5 of 5 (2)
Stoic Alpine Merino 150 Crew - Long-Sleeve Top
user rating: 5 of 5 (2)
Icebreaker Everyday Long Sleeve Crewe Top
user rating: 5 of 5 (2)
Under Armour ColdGear Fitted Legging Bottom
$50 MSRP
user rating: 5 of 5 (2)
U.S. Military Gen III, Level 2 ECWCS Top Top
user rating: 4.5 of 5 (4)
Icebreaker 260 Midweight LS Crewe Top
$100 MSRP
user rating: 4.5 of 5 (3)
Smartwool Microweight Crew Top
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Recent Base Layer Reviews

rated 1 of 5 stars
Isobaa Merino 200 Zip Neck Hoodie

I don’t recommend even being cheaper than other brands. I think it is worth paying a little more for a quality brand that lasts a long time.             I have a couple of garments of this brand and I am very unhappy with the quality. Merino wool has features like durability, warmth, or that does not smell. I have had merino clothes since years but Isobaa is, by far, the worst quality. After one year using a hooded jacket, the cuffs are shattered with holes and the general aspect is very… Full review

rated 5 of 5 stars
U.S. Military Gen III, Level 2 ECWCS Top

I agree. Great layer. I live in Colorado and use this Level 2 layer—I agree with the other reviewer. You just have to make sure you are getting the authentic Polartec fabric version spec. Needs to have Polartec tags. Full review

rated 5 of 5 stars
Helly Hansen HH LIFA Stripe Crew

A classic go-to for late autumn-winter-early spring. Tough as nails and a very practical change from wool and other fibres. My “cold weather” (similar to Lester’s) version is now 10 years old and doesn’t show any signs of giving up the ghost. I will say it’s comparable to wool. Not the same AS wool but if you can find a man-made fibre shirt that is known around the world for its quality and practicality, and durability then please let everyone know. When humping a pack, I tend to wear… Full review

rated 5 of 5 stars
Helly Hansen HH LIFA Stripe Crew

An all-time classic design. Form meets function. Every competing manufacturer has tried to persuade the public that the original HH vest is outmoded. It has no zips, pockets, or gimmicks, it isn't made of a new wonder material or rediscovered 'smart' wool. The look is like something from an '80s magazine. So why do they still get made—and sold all over the world—in large quantities? Warmth and wicking. The Lifa polypropylene meets both criteria, when your body is working near maximum and the… Full review

rated 4.5 of 5 stars
FORLOH Deep Space Half Zip Long Sleeve Top

An impressive, USA-made quarter-zip synthetic baselayer that somehow doesn't get stinky, even after sweaty hikes in the mountains. With excellent moisture-wicking properties and an athletic feel, this baselayer is comfortable and ready to go on all-day adventures in the autumn or winter. While the camo-pattern is targeted toward hunters, it appears the company will be releasing solid color options too, making it more appealing to non-hunting pursuits like hiking, backpacking, skiing, snowshoeing,… Full review

rated 5 of 5 stars
Isobaa Merino 200 Zip Neck Hoodie

Isobaa's Merino 200 Zip Neck Hoodie is a high performance hoodie that looks great on the trail or around the home. Made from ethically-sourced merino wool, the top has great thermal properties, breathes well, and is quick drying and naturally odour-resistant. This hoodie will ensure you are comfortable in any weather conditions—while running, hiking, cycling, or other outdoor activities— either on its own or as part of a layering system.   It's my go-to top for trail running at dawn when it… Full review

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