Free return under 100 days

Free shipping on £150

Expert Help

Schedule an appointment

+33 1 84 67 14 24

Login

My account

Men's Outdoor Clothing
Men's Sports Underwear
Men's Baselayers

Men's Baselayers

(437)

Sort by

437 Results

Filter

Sports underwear

Men

Women

adidas

Assos

Berghaus

Black Diamond

Bogner Fire + Ice

BV Sport

Castelli

CMP

Craft

Dainese

Dale of Norway

Devold

Endura

GripGrab

Helly Hansen

Houdini Sportswear

icebreaker

La Sportiva

Maap

Maier Sports

Maloja

Mammut

Millet

Mizuno

Mons Royale

Mountain Equipment

Mountain Hardwear

New Balance

Ortovox

Outdoor Research

Patagonia

Poc

Protest

Rab

Rossignol

Smartwool

Soar Running

Sportful

X-Bionic

Trail running

Running

Skiing

Climbing

Daily use

Mountain Bike

£0 - £25

£25 - £50

£50 - £75

£75 - £100

£100 - £125

£125 - £150

0% - 10%

10% - 20%

20% - 30%

30% - 40%

40% - 50%

+ 50%

Bluesign™

Recycled

Origine Européenne Garantie

PFC-Free

ZQ Merino

Ecomaterial

T-shirt

Top base layer

Thermal jersey

Merino Wool Jersey

Technical jersey

Bottom base layer

No

Yes

Short

Long

Syears

Polygiene®

Polartec® Power Grid

Polartec® Power Grid™

Polygiene®

HeiQ Fresh

Breath Thermo®

Sort by

MizunoActive Warmalite Half Zip Long Sleeve Top - Base layer - Men's£71,90

DevoldLauparen Merino 190 Shirt - Merino Wool Jersey - Men's

adidasTerrex Xperior Merino 200 SS - Merino Wool Jersey - Men's

MilletTrilogy Wool TS LS - Merino Wool Jersey - Men's£89,90

MilletDrynamic Warm 1/2 Zip - Merino Wool Jersey - Men's

CMPMen's base layer pant - Base layer - Men's

MilletDrynamic Soft LS Tee - Base layer - Men's£62,90

Mountain EquipmentIgnis Tee - Base layer - Men's

X-BionicInvent 4.0 Pants - Base layer - Men's

MilletDrynamic Soft LS 1/2 Zip - Base layer - Men's£71,90

adidasTerrex Xperior Merino 150 LS - Merino Wool Jersey - Men's

DevoldDuo Active Merino 205 Longs - Merino wool Thermal Tight - Men's

MilletDrynamic Soft 3/4 Tight - Base layer - Men's£53,90

Helly HansenHH Tech 1/2 Zip 2.0 - Base layer - Men's£35,90

adidasTerrex Xperior Merino 260 LS - Merino Wool Jersey - Men's

Helly HansenTyri Knit Hoodie - Base layer - Men's£76,90

CraftActive Extreme X Wind SS - Base layer - Men's

ProtestRewill 1/4 Zip Top - Base layer - Men's

Helly HansenTyri Knit Hoodie - Base layer - Men's£76,90

CMPMen's Merino wool base layer tights - Base layer - Men's£62,90

Helly HansenShine Solen LS Crew - Base layer - Men's

Helly HansenTyri Knit Hoodie - Base layer - Men's£76,90

Helly HansenLifa Active Stripe Crew - Base layer - Men's

Sportful2Nd Skin Tee - Base layer - Men's

Helly HansenTrail SS T-Shirt - Base layer - Men's£40,90

CraftActive Intensity Long Sleeve - Base layer - Men's

Helly HansenLifa Pant - Base layer - Men's£40,90

Helly HansenTyri Knit 1/2 Zip - Base layer - Men's£76,90

ProtestRewill 1/4 Zip Top - Base layer - Men's

Helly HansenHH Tech 1/2 Zip 2.0 - Base layer - Men's£35,90

Helly HansenTyri Knit 1/2 Zip - Base layer - Men's£76,90

New BalanceSport Essentials Heathertech T-Shirt - Base layer - Men's

CMPMen's LS crew neck base layer - Base layer - Men's

Helly HansenHH Tech T-Shirt 2.0 - Base layer - Men's£26,90

CMPMen's LS crew neck base layer - Base layer - Men's

CMPMen's multifunctional Seamless stretch pants - Base layer - Men's£26,90

Helly HansenHP 1/2 Zip Pullover 2.0 - Base layer - Men's£67,90

CMPSeamless base layer tights - Base layer - Men's

CMPMen's Seamless short sleeves underwear jersey - Base layer - Men's£26,90

Helly HansenHH Tech Crew LS 2.0 - Base layer - Men's£31,90

CMPSeamless base layer tights - Base layer - Men's

Helly HansenHH Tech T-Shirt 2.0 - Base layer - Men's£26,90

Helly HansenHP 1/2 Zip Pullover 2.0 - Base layer - Men's£67,90

Helly HansenHH Tech Hoodie - Base layer - Men's£40,90

Helly HansenHH Tech T-Shirt 2.0 - Base layer - Men's£26,90

Helly HansenHP 1/2 Zip Pullover 2.0 - Base layer - Men's£67,90

Helly HansenHH Tech Crew LS 2.0 - Base layer - Men's£31,90

Helly HansenHP 1/2 Zip Pullover 2.0 - Base layer - Men's£67,90

Helly HansenHP 1/2 Zip Pullover 2.0 - Base layer - Men's£67,90

Helly HansenHH Tech Hoodie - Base layer - Men's£40,90

Helly HansenHH Tech 1/2 Zip 2.0 - Base layer - Men's£35,90

Helly HansenHH Tech T-Shirt 2.0 - Base layer - Men's£26,90

Helly HansenHP 1/2 Zip Pullover 2.0 - Base layer - Men's£67,90

Helly HansenHH Tech Hoodie - Base layer - Men's£40,90

MalojaSacconsM. - Base layer - Men's£112,90

MalojaSacconsM. - Base layer - Men's£112,90

MalojaSacconsM. - Base layer - Men's£112,90

MalojaFedeM. Shirt - Base layer - Men's£143,90

MalojaFedeM. Shirt - Base layer - Men's£143,90

Ortovox185 Rock'N'Wool Zip Neck - Merino Wool Jersey - Men's£116,90

1
2
3
4
5
6
...
8

Our top brands

Patagonia Ortovox Rab La Sortiva Lowa Altra Millet Moon Boot Helly Hansen Barbour Fjällräven Columbia Scarpa Vaude Mammut Julbo New Balance Hanwag Birkenstock Petzl

Our top trending categories

Women's Down jackets Women's Parkas Women's Fleece jackets Men's Down jackets Men's Parkas Men's Fleece jackets Tents Sleeping pads Headlamps Sleeping bags Stoves Hiking backpacks Ice axes Hiking shoes & boots Trail running shoes Running shoes Climbing shoes Kids' Hiking shoes & boots Cycling helmets Kids' carriers Kids' Clothing Kids' Fleece jackets Aigle Kids' Rain shoes Patagonia Fleece jackets Pyrenex Down jackets Helly Hansen Jackets Columbia Fleece jackets Black Diamond Headlamps Meindl Shoes Dakine Backpacks Assos Cycling shorts Giro Helmets Rab Down jackets Dog Harnesses Dog Leads & Leashes Ortlieb Panniers Altra Shoes Buff Neckwear Abus Cycling helmets Patagonia Down Jackets

Need Help?

To choose your waterproof jacket, your trail shoes or to modify an order, contact our HardGuides!

Write to us!

Keep in touch

Be the first to discover our new products, exclusive sales, adventure ideas & tips, and get £5 off your next order

E-mail adress

Free shipping on £150Free return under 100 daysCarbon neutral

Our mission

At Hardloop, we believe that nature and being on the move should be at the very heart of our lives. Whether you're a first-timer or a top athlete, since 2015 we've been sharing with you our love of good gear and our passion for the steep trails we love to run around on.

Read more +

Customer Service

All help topics
Track my order
Return & refund
Size Charts & Fit Guide

Hardloop

Who are we?
HardGuides

Carbon neutral since 2015

Our Footprint
Carbon neutrality
HardGreen selection

Logistics partner

100% secured payment system

Easy Online Shopping

Free delivery from £150
100 Days refund policy
Customer service free of charge

© Hardloop 2026
Legal Notice
Terms of Use
Privacy Policy & Data Tracking
Data preferences

More adventures

Hardloop International