Base Layers and Underwear

The best base layers and underwear, reviewed and curated by the Trailspace community. The latest review was added on November 18, 2018. Stores' prices and availability are updated daily.

Recent Base Layer Reviews

Avalanche Wear Mogul Pant

rated 0.5 of 5 stars Pants pilled (outside of fabric) like crazy after wearing one or two times. Didn't even wash yet. Pilling was on front and side of my thighs. Loved the fit but the pilling is intolerable! Would have purchased several of these - instead will be donating :( Would NOT recommend. Very disappointing! Pants pilled (outside of fabric) like crazy after wearing one or two times. Didn't even wash yet. Pilling was on front and side of my thighs. Loved the fit but the pilling is intolerable!Would have purchased… Full review

MEC T3 Zip-T

rated 4.5 of 5 stars Excellent thermal base-layer top. This review is for the standard (Synthetic) T3 Zip-T, not the more expensive Merino Wool version. The photo shows the 2-tone Eclipse Heather/Coal colouration. The T3 is the thickest in MEC's own line of thermal base layers. The T2 and T1 are each lighter and thinner than the previous. The Zip-T model of the shirt has a half-length zipper (as the name implies) and a tall collar when fully zipped, almost like a turtle-neck. No pockets; no cinches or draw cords; no… Full review

Louis Garneau Arm Coolers

rated 2.5 of 5 stars Costly. Fit well if sized correctly. Cool and sunburn-free. Info tag pokes. Latex! LATEX: If you have a latex allergy, do not use these. Info tag pokes your underarm soft skin if you don't fold correctly. Otherwise, they keep the sun off and feel cool. Rather expensive. Full review

prAna Sophia Bra Top

rated 5 of 5 stars This bra does a nice "lift and separate." The plunging neckline looks great for me, which isn't usually a flattering style on my figure. I can't wear regular bras, only sports bras, and this is comfortable, supportive, AND looks great! I'm excited to wear some favorite dresses and not worry about my bra and the neckline. Full review

The Elixir UV Arm Sleeves

rated 4.5 of 5 stars Arm covers to protect you from the sun. Sun protection using lightweight arm sleeves that have numerous color choices. In the hot summer, a long sleeved shirt may make you feel too warm. While wearing a short sleeve shirt, the arm covers prevent sunburn and help keep your arms cool. In the shade, take them off it you want. They compress to a baseball size. I have another pair from a bike gear company that costs $30+ and liked them a lot. I looked online and found lots of black ones that seemed they… Full review

Helly Hansen LIFA Merino Pant

rated 4.5 of 5 stars An excellent base layer choice from a company that understands cold and wet weather. The HH LIFA Merino 2-layer construction keeps you warm and dry in all kinds of conditions, and feels great when wearing it. Watch out for the “athletic” fit when purchasing, but if you get the right fit this base layer will keep you comfortable in rain, sleet, and snow well below freezing. Note that this is a companion review with the Helly Hansen LIFA Merino 1/2 Zip top.Product Description Helly Hansen (HH)… Full review

Helly Hansen LIFA Merino 1/2 Zip

rated 4.5 of 5 stars An excellent base layer choice from a company that understands cold and wet weather. The HH LIFA Merino 2-layer construction keeps you warm and dry in all kinds of conditions, and feels great when wearing it. Watch out for the “athletic” fit when purchasing, but if you get the right fit this base layer will keep you comfortable in rain, sleet, and snow well below freezing. Note: This is a companion review along with the Helly Hansen LIFA Merino Pant. Product Description Helly Hansen (HH) LIFA… Full review

Fjallraven Bergtagen Longjohns

rated 5 of 5 stars The Fjallraven Bergtagen Long Johns is a base layer pant that utilizes wool in three different weaves to maximize heat retention in key areas (butt, groin) and breathability in others (thighs, calves). It’s a total home run of execution and since I received this base layer for testing I have worn nothing else. It’s exceptionally well tailored, durable, doesn’t stink on multi-day trips, and you’ll have no fear around a fire. The only possible negatives are more inherent to wool, than this… Full review

Fjallraven Bergtagen Woolmesh Sweater

rated 5 of 5 stars The Fjallraven Bergtagen Woolmesh Sweater is a base layer top that utilizes wool in three different weaves to maximize heat retention in key areas (chest, back) and breathability in others (stomach, underarms). It’s a total home run of execution and since I received this top for testing I have worn nothing else. It’s exceptionally well tailored, durable, doesn’t stink on multi-day trips, and you’ll have no fear around a fire. The only possible negatives are more inherent to wool, than this… Full review

user rating: 4.5 of 5 (9)
ExOfficio Give-N-Go Boxer Brief Boxer/Brief/Bikini
$15 - $30
user rating: 5 of 5 (2)
Icebreaker Oasis Long Sleeve Crewe Top
$35 - $109
user rating: 5 of 5 (2)
Arc'teryx Rho LT Zip Neck Top
$87 - $125
user rating: 5 of 5 (2)
Patagonia R1 Pants Bottom
$119
user rating: 5 of 5 (2)
Smartwool Midweight Zip T Top
$45 - $100
user rating: 5 of 5 (2)
Icebreaker Everyday Long Sleeve Crewe Top
$49 - $70
user rating: 4.5 of 5 (3)
Smartwool Microweight Tee Top
$38 - $55
user rating: 5 of 5 (1)
Patagonia Capilene 2 Lightweight Crew Top
$36 - $49
user rating: 5 of 5 (1)
Fjallraven Bergtagen Longjohns Bottom
$140
user rating: 5 of 5 (1)
Smartwool Midweight Crew Top
$42 - $95
user rating: 5 of 5 (1)
Icebreaker Siren Bra Sports Bra
$50
user rating: 5 of 5 (1)
ExOfficio Give-N-Go Lacy Bikini Boxer/Brief/Bikini
$17
user rating: 5 of 5 (1)
Smartwool NTS Mid 250 Bottom Bottom
$50 - $95
user rating: 5 of 5 (1)
Fjallraven Bergtagen Woolmesh Sweater Top
$160
user rating: 5 of 5 (1)
Patagonia Capilene 3 Midweight Bottoms Bottom
$28 - $59
user rating: 4 of 5 (4)
Smartwool Lightweight Zip T Top
$49
user rating: 4.5 of 5 (1)
Patagonia Capilene Lightweight T-Shirt Top
$27 - $39
user rating: 4.5 of 5 (1)
ExOfficio Give-N-Go Sport Mesh Brief Boxer/Brief/Bikini
$14 - $26
user rating: 4.5 of 5 (1)
Patagonia Capilene Lightweight Bottoms Bottom
$34 - $49
user rating: 4.5 of 5 (1)
Icebreaker Anatomica Brief Boxer/Brief/Bikini
$35 - $40
user rating: 4.5 of 5 (1)
Kenyon Power Stretch Baselayer Bottoms Bottom
$25
user rating: 4.5 of 5 (1)
Airblaster Ninja Suit One-Piece Base Layer
$71 - $109
user rating: 4 of 5 (2)
Smartwool Midweight Bottom Bottom
$42 - $66
user rating: 4 of 5 (2)
Marmot Midweight Zip LS Top
$60
user rating: 4 of 5 (2)
Outdoor Research ActiveIce Sun Sleeves Arm/Leg Sleeve
$22 - $28
user rating: 4 of 5 (1)
SportHill Northwind Unders Boxer/Brief/Bikini
$35 - $48
user rating: 4 of 5 (1)
ExOfficio Sol Cool Boxer Brief Boxer/Brief/Bikini
$20 - $37
user rating: 4 of 5 (1)
Patagonia Capilene Daily T-Shirt Top
$20 - $39
user rating: 4 of 5 (1)
Terramar Thermolator II Pant Bottom
$15 - $19
user rating: 4 of 5 (1)
ExOfficio Give-N-Go Lacy Full Cut Brief Boxer/Brief/Bikini
$17
user rating: 4 of 5 (1)
Icebreaker 200 Lightweight Legging Bottom
$42
user rating: 3.5 of 5 (2)
ExOfficio Give-N-Go Boxer Boxer/Brief/Bikini
$15 - $30
user rating: 3.5 of 5 (1)
Toad&Co Pacer Slim Long Sleeve Quarter Zip Top
$37
user rating: 3 of 5 (2)
Icebreaker Oasis Crewe S/S Top
$54 - $80
user rating: 2.5 of 5 (1)
Louis Garneau Arm Coolers Arm/Leg Sleeve
$30
user rating: 2.5 of 5 (5)
Avalanche Wear Mogul Pant Bottom
$20
user rating: 2 of 5 (1)
Terramar Silk Pant Bottom
$26
Sugoi SubZero Tight Bottom
$100
Montane Primino 140 Long Janes Bottom
$90
Minus33 Tecumseh Midweight 3/4 Bottoms Bottom
$60
REI Lightweight Base Layer Half-Zip Top
$40
L.L.Bean Cresta Wool Ultralight 150 Long-Sleeve Top
$59
Patagonia Capilene Daily Boxers Boxer/Brief/Bikini
$35
L.L.Bean Silk Underwear, Crewneck Top
$55
Rab Merino+ 120 Long Sleeve Tee Top
$85
Montane VIA Armguard Arm/Leg Sleeve
$35
Icebreaker Siren Bikini Boxer/Brief/Bikini
$30
Patagonia Capilene 2 Lightweight V-Neck
$36
Outdoor Research Protector Sun Sleeves Arm/Leg Sleeve
$14
Patagonia Capilene 1 Crew Top
$42 - $49
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