Men's Active Underwear & Baselayers

Icebreaker

200 Oasis LS Crew Top - Men's

1 color

Current price: $60.00 - $68.25 Original price: $120.00

Up to 50% off

(8)

GOREWEAR

R5 GORE-TEX INFINIUM Tight - Men's

2 colors

Current price: $74.98 - $89.97 Original price: $149.95

Up to 50% off

Earn Up To 5% Cash Back With Summit+

GOREWEAR

CONCURVE Thermo Hybrid Tight - Men's

3 colors

Current price: $45.50 - $78.00 Original price: $130.00

Up to 65% off

Icebreaker

Merino 260 Quantum Long-Sleeve Zip Hoodie - Men's

3 colors

Current price: $125.00 - $150.00 Original price: $250.00

Up to 50% off

Earn Up To 5% Cash Back With Summit+

GOREWEAR

R3 Thermo Tight - Men's

2 colors

Current price: $49.98 - $54.97 Original price: $99.95

Up to 50% off

Black Diamond

Coefficient LT One-Piece - Men's

1 color

Current price: $90.00 Original price: $200.00

55% off

Icebreaker

Merino Blend 200 RealFleece Descender LS Zip Hoodie - Men's

3 colors

Current price: $108.00 - $117.00 Original price: $180.00

Up to 40% off

Earn Up To 5% Cash Back With Summit+

GOREWEAR

Concurve Thermo Tight - Men's

1 color

Current price: $66.00 Original price: $120.00

45% off

Earn Up To 5% Cash Back With Summit+

Icebreaker

260 Tech Long-Sleeve Crew Top - Men's

1 color

Current price: $75.00 Original price: $125.00

40% off

Earn Up To 5% Cash Back With Summit+

Icebreaker

Merino 260 Quantum Long-Sleeve Zip Top - Men's

2 colors

Current price: $121.00 - $132.00 Original price: $220.00

Up to 45% off

Earn Up To 5% Cash Back With Summit+

Icebreaker

200 Oasis Fly Legging - Men's

1 color

Current price: $63.00 Original price: $105.00

40% off

The North Face

Elevation 1/4-Zip Top - Men's

3 colors

Current price: $30.00 Original price: $50.00

40% off

Icebreaker

Merino 260 Tech Long-Sleeve 1/2-Zip Top - Men's

1 color

Current price: $81.00 Original price: $135.00

40% off

Earn Up To 5% Cash Back With Summit+

Airblaster

Classic Ninja Suit - Men's

1 color

Current price: $74.98 Original price: $149.95

50% off

The North Face

A68A Circular DotKnit Tight - Men's

1 color

Current price: $60.00 Original price: $100.00

40% off

Icebreaker

300 MerinoFine Polar Long-Sleeve 1/2-Zip - Men's

2 colors

Current price: $150.00 Original price: $250.00

40% off

Earn Up To 5% Cash Back With Summit+

Icebreaker

Merino Blend 200 RealFleece Descender LS 1/2-Zip Top - Men's

2 colors

Current price: $80.00 - $96.00 Original price: $160.00

Up to 50% off

GOREWEAR

Concurve Tight - Men's

3 colors

Current price: $55.00 Original price: $100.00

45% off

Free Standard Shipping

Icebreaker

300 MerinoFine Polar Long-Sleeve Roll Neck Top - Men's

1 color

Current price: $132.00 Original price: $220.00

40% off

Earn Up To 5% Cash Back With Summit+

Icebreaker

Merino Blend 300 RealFleece Descender LS Zip Top - Men's

1 color

Current price: $138.00 Original price: $230.00

40% off

Earn Up To 5% Cash Back With Summit+

Backcountry

BGA Pines Microgrid Ultra-Lt Baselayer 1/4-Zip Top - Men's

2 colors

Current price: $49.50 Original price: $99.00

50% off

Rab

Basecamp Logo Badge Long-Sleeve T-Shirt - Men's

3 colors

Current price: $25.20 Original price: $42.00

40% off

Mammut

Trift Long Tights - Men's

1 color

Current price: $62.50 Original price: $125.00

50% off

Free Standard Shipping

GOREWEAR

Impulse Tight - Men's

1 color

Current price: $49.47 - $49.50 Original price: $90.00

45% off

Free Standard Shipping

Le Bent

Lightweight Crew - Men's

1 color

Current price: $87.71 Original price: $116.95

25% off

Backcountry

BGA Pines Microgrid UL Baselayer 1/2-Zip Scuba Top - Men's

2 colors

Current price: $44.50 Original price: $89.00

50% off

BlackStrap

Spectrum Full-Zip Top - Men's

2 colors

Current price: $95.97 Original price: $159.95

40% off

Rab

Conduit Crew - Men's

1 color

Current price: $45.00 Original price: $75.00

40% off

GOREWEAR

Concurve 3/4 Tight - Men's

2 colors

Current price: $49.50 Original price: $90.00

45% off

Swix

Tista 1/2-Zip Mid Layer Top - Men's

2 colors

Current price: $44.97 Original price: $74.95

40% off

Earn Up To 5% Cash Back With Summit+

Swix

Tista Crew Neck Mid Layer Top - Men's

1 color

Current price: $41.22 Original price: $74.95

45% off

Earn Up To 5% Cash Back With Summit+

Swix

Tista Pull-Over Hoodie - Men's

2 colors

Current price: $34.98 - $41.97 Original price: $69.95

Up to 50% off

Earn Up To 5% Cash Back With Summit+

Rab

Force Long-Sleeve T-Shirt - Men's

2 colors

Current price: $27.50 - $33.00 Original price: $55.00

Up to 50% off

Mountain Hardwear

Kor Alloy Tight - Men's

1 color

Current price: $100.00 Original price: $199.99

50% off

La Sportiva

Tour Long-Sleeve Top - Men's

1 color

Current price: $39.50 Original price: $79.00

50% off

Le Bent

Midweight Crew - Men's

1 color

Current price: $95.96 Original price: $127.95

25% off

Earn Up To 5% Cash Back With Summit+

GOREWEAR

Concurve Short Tight - Men's

2 colors

Current price: $40.00 Original price: $80.00

50% off

Backcountry

BGA Pines Microgrid Ultra-LT Baselayer Crew Top - Men's

1 color

Current price: $49.50 Original price: $99.00

50% off

Backcountry

BGA Cedars RWS Merino Mid-Wt Baselayer Bottom - Men's

1 color

Current price: $49.50 Original price: $99.00

50% off

Icebreaker

Merino Blend 200 Shifter II Pant- Men's

1 color

Current price: $75.00 Original price: $150.00

50% off

ExOfficio

Everyday Boxer Brief - Men's

1 color

Current price: $16.25 Original price: $32.50

50% off

The North Face

Sunriser Hoodie - Men's

2 colors

Current price: $48.00 Original price: $80.00

40% off

Men's Underwear & Baselayers

Brand

Clothing Size

XS (1)

S (29)

M (19)

L (15)

XL (26)

XXL (17)

3XL (1)

25 (5)

28 (5)

29 (4)

30 (1)

31 (3)

32 (2)

35 (3)

39 (7)

40 (7)

42 (10)

US XXL/EU 3XL (2)

Color

Sale

10% and more (67)

20% and more (66)

30% and more (61)

40% and more (58)

50% and more (27)

Recommended Use

All-Mountain Skiing (32)

All-Mountain Snowboarding (32)

Hiking (29)

Trail Running (27)

Backcountry Skiing (26)

Casual (26)

Backcountry Snowboarding (25)

Road Running (25)

Freeride/Powder Skiing (19)

Freeride/Powder Snowboarding (19)

Park & Freestyle Skiing (18)

Park & Freestyle Snowboarding (18)

Nordic Classic (14)

Nordic Skate (14)

Nordic Touring (14)

Fit

Semi-Fitted/Slim (26)

Regular/Relaxed (19)

Form-Fitting (13)

Compressive (1)

Price

$0 - $49.99 (32)

$50 - $99.99 (27)

$100 - $199.99 (7)

$200 - $499.99 (1)

Features

Anti-Odor (22)

Pockets (18)

Thumbholes (11)

Reflective (9)

Abrasion Resistant (7)

Thermal (5)

Stretch Fabric (3)

Adjustable Waist (2)

Sun Protection (2)

Split-Leg (1)

Water Resistant (1)

Material

Synthetic (45)

Wool (17)

Cotton (4)

Insulation

Fleece (4)

Wool (2)

Length

Short (4)

Mid-Thigh (3)

Long (1)

Insulation Weight

Midweight (17)

Lightweight (11)