Base Layers and Underwear


One-Piece Base Layers
Boxers, Briefs, Bikinis
Sports Bras
Arm and Leg Sleeves


Under Armour




less than $25
$25 - $49.99
$50 - $99.99
$100 - $199.99
$200 - $299.99
$300 - $399.99
$400 - $499.99
$500 and above

Recent Base Layer Reviews

Outdoor Research ActiveIce Sun Sleeves

rated 5 of 5 stars Out of all the clothes I’ve used for hiking this is by far the cleverest, well executed, and best functional garment I had. I hiked over 1,000 miles with those sleeves, and did it in blazing sun, high altitude high radiation, and hot conditions. I have very white sensitive skin, and I was appalled by the thought of carrying and applying sun screen for the whole trip. Fortunately I came across the ActiveIce Sun Sleeves that offered the ideal solution for sun protection. Pros: Blocks the sun! It… Full review

Ridge Merino Inversion Midweight Bottoms

rated 4.5 of 5 stars These high quality, high performance mid-weight base layer bottoms perform without adding unnecessary bulk! Unrestrictive and warm, Ridge’s new base layer line is ideal for people who have an active outdoor lifestyle. Whether skiing, backpacking, or even doing outdoor chores, the merino wool Inversion will help regulate temperature regardless of the conditions! A winter afternoon walk with Otto SPECS 18.5 micron merino wool 190g weight UPF 50+ 100% recycled polyester waistband Flatlocked seams… Full review

Avalanche Wear Women's Mogul Fleece Legging

rated 5 of 5 stars Where I live temperatures can drop well below zero I have never even thought about wearing a second pair of pants. The inner fleece lining is super soft and wicks moisture away from your skin also blocks wind. Washes well without breaking down. I've had my pair for two years and they're still my go-to winter running pants. Stretch as well when running. I have the woman's version of these pants, but could not find them on the site and wanted to express how much I truly love these pants. Full review

U.S. Armed Forces Gen III, Level 2 ECWCS Top

rated 5 of 5 stars U.S. made Polartec Power Grid fleece top for $20. Compare to the $100 Patagonia R1 which is now made overseas. I find myself wearing the level 2 grid fleece top (aka waffle top) more than any other garment when playing outdoors. Here's why: Ultra breathable Great wicking properties Warm, even as an outer layer Versatile: can be used effectively as a base, mid, or outer layer Thumb holes to facilitate the donning of other layers Half zip for venting Even if I do sweat while wearing this, the impressive… Full review

MyPakage Pro Series 2-in-1

rated 5 of 5 stars Pro series long underwear and athletic shorts in one package. The unique MyPakage 3 dimensional pouch protects your precious parts. Unless you have worn MyPakage underwear, you are really missing a great experience. Utilizing their 3-dimensional keyhole technology pouch that surrounds your package, they give you the best feeling underwear on the planet. There is no more adjusting your package because the pouch keeps everything nicely tucked away and not in constant contact with your legs. Forget… Full review

Terramar Men's Silk Pant

rated 2 of 5 stars Great pajamas, poor base layer. Thermasilk base layer from Terramar is not adequate for outdoor sports or any type of physical activity: It is far too weak and fragile. It is too thin to provide any warmth, and when wet, they feel cold. They will rip and shred if worn in an endurance sports or hard work setting. Also, they do not hold their shape. Hand-washing brings back their original shape, but they become limp after a couple of days out in the field. On the other hand, they make the best pajamas,… Full review

Sherpa Adventure Gear Men's Baans Tech Quarter Zip

rated 4.5 of 5 stars Used this for basecamp warmth after hiking 7 to 9 hours in the fall Maine weather. After hiking all day relied on this to stay warm while setting up campsite and in the cool fall Maine mornings to stay warm while breaking down. Keeps you extremely warm and comfortable during these critical times. This pullover fits great and is extremely comfortable after a long day of hard hiking. Provides essential warmth in the cool fall Maine weather after a great day's hiking, or in the early cold fall mornings. Full review

Kora Shola 230 Crew

rated 5 of 5 stars Warm, soft, well-fitting, comfortable even in warmer temperatures. It's been years since I've lived in a climate cold enough for a base layer. Actually it's been 13 years... I remember them as itchy, uncomfortable, and most of the time I would rather freeze than wear them. I definitely have needed them since returning, and I decided to bite the bullet and pick up a set for the upcoming winter, which the Farmer's Almanac says will be one of the coldest winters in some time. I typically would not… Full review

Patagonia Men's Capilene 2 Lightweight Zip-Neck

rated 4.5 of 5 stars Super lightweight at 6.5 oz. Very quick dry. Super open breathability without giving up warmth. Great light, breathable, super quick dry base layer. Fits snug to body, but doesn't stick. Allows for easy layering without that cramped tight feeling. Don't leave home without it!!!! Full review

Top-Rated Base Layers and Underwear

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Icebreaker Oasis Legless Base Layer Bottom
$5 - $80
Icebreaker Sprite Racerback Bra Sports Bra
$7 - $60
ExOfficio Give-N-Go Full Cut Brief Boxers, Briefs, Bikini
$8 - $20
ExOfficio Give-N-Go Bikini Brief Boxers, Briefs, Bikini
$8 - $18
ExOfficio Give-N-Go Lacy Low Rise Bikini Boxers, Briefs, Bikini
$9 - $21
REI Lightweight Long Underwear Crew Top Base Layer Top
user rating: 5 of 5 (1)
ExOfficio Give-N-Go Lacy Bikini Boxers, Briefs, Bikini
$10 - $23
user rating: 4 of 5 (1)
ExOfficio Give-N-Go Lacy Full Cut Brief Boxers, Briefs, Bikini
$10 - $23
ExOfficio Give-N-Go Tank Top Base Layer Top
$10 - $19
ExOfficio Give-N-Go Boy Cut Brief Boxers, Briefs, Bikini
ExOfficio Give-N-Go Lacy Thong Boxers, Briefs, Bikini
$11 - $21
ExOfficio Give-N-Go Lacy Tank Base Layer Top
REI Lightweight Long Underwear Zip Top Base Layer Top
ExOfficio Give-N-Go Cross Over Bra Sports Bra
$13 - $25
Cabela's MTP Heavy Weight 1/4 Zip Base Layer Top
Cabela's MTP Polar-Weight Bottom Base Layer Bottom
ExOfficio Give-N-Go String Bikini Boxers, Briefs, Bikini
$13 - $17
EMS Techwick Hydro 1/2 Zip Pullover Base Layer Top
Under Armour Original Series 6-inch Boxerjock Boxers, Briefs, Bikini
$14 - $20
REI Mesh MTS Briefs Base Layer Bottom
ExOfficio Give-N-Go Shelf Bra Camisole Sports Bra
$14 - $37
Smartwool Microweight Thong Boxers, Briefs, Bikini
$14 - $15
EMS Midweight Baselayer Pant Base Layer Bottom
Under Armour Original Series 3-inch Boxerjock Boxers, Briefs, Bikini
$14 - $20
Patagonia Active Briefs Boxers, Briefs, Bikini
$14 - $24
REI Heavyweight Crew Long Underwear Top Base Layer Top
$15 - $29
REI Heavyweight Half-Zip Long Underwear Top Base Layer Top
$15 - $34
user rating: 4 of 5 (1)
Terramar Thermolator II Pant Base Layer Bottom
$15 - $17
Polarmax Maxride Pants Base Layer Bottom
$15 - $19
Polarmax Tech Silk Boxer Boxers, Briefs, Bikini
Patagonia Capilene 1 Silkweight Briefs Boxers, Briefs, Bikini
user rating: 4 of 5 (1)
Under Armour Original Series 9-inch Boxerjock Boxers, Briefs, Bikini
ExOfficio Give-N-Go Brief Boxers, Briefs, Bikini
$15 - $20
Under Armour HeatGear Legging Base Layer Bottom
$15 - $25
Patagonia Capilene Bottom Base Layer Bottom
Patagonia Barely Hipster Boxers, Briefs, Bikini
$15 - $22
Polarmax Tech Fleece Crew Neck Base Layer Top
Dynafit Performance Sleeves Arm or Leg Sleeves
Cloudveil Lightweight Crewneck Top Base Layer Top
ExOfficio Give-N-Go Sport Brief Boxers, Briefs, Bikini
$16 - $19
Moving Comfort Workout Bikini Boxers, Briefs, Bikini
$16 MSRP
SAXX Fiesta Boxer Boxers, Briefs, Bikini
$16 - $24
Patagonia Barely Bikini Boxers, Briefs, Bikini
$16 - $22
Outdoor Research Echo Boxer Briefs Boxers, Briefs, Bikini
user rating: 5 of 5 (7)
ExOfficio Give-N-Go Boxer Brief Boxers, Briefs, Bikini
$17 - $29
REI Mesh MTS Boxer Briefs Base Layer Bottom
REI Mesh MTS Boxers Base Layer Bottom
REI Midweight Long Underwear Half-Zip Base Layer Top
Kenyon Power Stretch Baselayer Top Base Layer Top
Terramar Silk Pointelle Scoop Base Layer Top
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