Men's Underwear & Underlayers

For any outdoor activity, what you wear next to the skin can make all the difference to your comfort. At Decathlon you’ll find a range of breathable and insulating men’s underwear, underlayers and base layers to layer up correctly.
43 items
WEDZE M Ski Thermal Base Layer Bottoms - BL 100 - Black
WEDZE M Ski Thermal Base Layer Bottoms - BL 100 - Black
Rate: 4.6 stars, 4509 votes
£5.99£7.99
SOLOGNAC BASE LAYER FLEECE TROUSERS 500 BROWN
SOLOGNAC BASE LAYER FLEECE TROUSERS 500 BROWN
Rate: 4.3 stars, 27 votes
£24.99
WEDZE Men’s Ski Base Layer Bottoms - BL 500 - Black
WEDZE Men’s Ski Base Layer Bottoms - BL 500 - Black
Rate: 4.7 stars, 546 votes
£14.99
INOVIK MEN'S 900 THERMAL CROSS-COUNTRY SKIING BASE LAYER BOTTOMS
INOVIK MEN'S 900 THERMAL CROSS-COUNTRY SKIING BASE LAYER BOTTOMS
Rate: 4.5 stars, 76 votes
£24.99
SOLOGNAC 500 Warm Hunting Wader Liners - Wetlands Camo
SOLOGNAC 500 Warm Hunting Wader Liners - Wetlands Camo
Rate: 4.6 stars, 31 votes
£29.99
ODLO ODLO Men's Blackcomb Eco Warm Leggings
ODLO ODLO Men's Blackcomb Eco Warm Leggings
Sold and shipped by Baselayer Ltd
£65.00
TCA Men's Super Thermal Compression Leggings - Black Stealth
TCA Men's Super Thermal Compression Leggings - Black Stealth
Sold and shipped by Thorogood Sports Ltd
£17.99£20.99
DLX Mens Base Layer Leggings Thermal Merino Wool Fitchner
DLX Mens Base Layer Leggings Thermal Merino Wool Fitchner
Sold and shipped by DLX
£46.99
ODLO ODLO Men's Blackcomb Eco Warm Leggings
ODLO ODLO Men's Blackcomb Eco Warm Leggings
Sold and shipped by Baselayer Ltd
£65.00
TCA Men's CarbonForce Quick Dry Base Layer Compression Shorts - Black Stealth
TCA Men's CarbonForce Quick Dry Base Layer Compression Shorts - Black Stealth
Sold and shipped by Thorogood Sports Ltd
£14.99£19.99
ODLO ODLO Men's Blackcomb Eco Warm Leggings
ODLO ODLO Men's Blackcomb Eco Warm Leggings
Sold and shipped by Baselayer Ltd
£65.00
TCA Men's Performance Base Layer Compression Shorts - Blueprint
TCA Men's Performance Base Layer Compression Shorts - Forest Night
TCA Men's Performance Base Layer Compression Shorts - Black Stealth
TCA Men's Performance Base Layer Compression Shorts - Grey Marl
TCA Men's Performance Base Layer Compression Shorts - Cabernet
TCA Men's Performance Base Layer Compression Shorts - Pro White
TCA Men's Performance Base Layer Compression Shorts - White
Gallery item 1 out of 7
TCA Men's Performance Base Layer Compression Shorts - Blueprint
Rate: 3.4 stars, 5 votes
7 colors
Sold and shipped by Thorogood Sports Ltd
£18.99
TCA Men's Super Thermal Compression Shorts - Graphite
TCA Men's Super Thermal Compression Shorts - Sonic Yellow
TCA Men's SuperThermal Compression Baselayer Short
TCA Men's SuperThermal Compression Baselayer Short
Gallery item 1 out of 4
TCA Men's Super Thermal Compression Shorts - Graphite
Rate: 4.0 stars, 1 votes
4 colors
Sold and shipped by Thorogood Sports Ltd
£18.99
RHINO Mens Sports Base Layer Shorts (White)
RHINO Mens Sports Base Layer Shorts (Red)
RHINO Mens Sports Base Layer Shorts (Navy)
RHINO Mens Sports Base Layer Shorts (Light Blue)
RHINO Mens Sports Base Layer Shorts (Heather Grey)
RHINO Mens Sports Base Layer Shorts (Black)
RHINO Mens Sports Base Layer Shorts (Bottle Green)
RHINO Mens Sports Base Layer Shorts (Royal)
Gallery item 1 out of 8
RHINO Mens Sports Base Layer Shorts (White)
8 colors
Sold and shipped by Pertemba GB
£18.99
WEDZE Men’s Thermal Merino Wool Ski Base Layer - BL 900 Bottoms - Navy blue
WEDZE Men’s Thermal Merino Wool Ski Base Layer - BL 900 Bottoms - Navy blue
Rate: 4.7 stars, 31 votes
£39.99£49.99
MACRON Macron Player Issue Match Day Base Layer Under Shorts
MACRON Macron Player Issue Match Day Base Layer Under Shorts
Sold and shipped by Rugby Heaven
£19.99
MACRON Macron Player Issue Match Day Base Layer Under Shorts
MACRON Macron Player Issue Match Day Base Layer Under Shorts
Sold and shipped by Rugby Heaven
£19.99
OOSC Saved By The Bell Mens Baselayer Pant
OOSC Saved By The Bell Mens Baselayer Pant
Sold and shipped by OOSC
£45.00
OOSC Hotstepper Mens Baselayer Pant
OOSC Hotstepper Mens Baselayer Pant
Sold and shipped by OOSC
£45.00
OOSC That 70's Show Mens Baselayer Pant
OOSC That 70's Show Mens Baselayer Pant
Sold and shipped by OOSC
£45.00
OOSC Nuts Cracker Mens Baselayer Pant
OOSC Nuts Cracker Mens Baselayer Pant
Sold and shipped by OOSC
£45.00
DARE 2B In The Zone II Men's Base Layer Leggings
DARE 2B In The Zone II Men's Base Layer Leggings
Sold and shipped by Regatta Ltd UK
£20.00£40.00
REGATTA Zimba Men's Fitness Baselayer Bottoms
REGATTA Zimba Men's Fitness Baselayer Bottoms
Sold and shipped by Regatta Ltd UK
£23.95£60.00
DARE 2B In The Zone Men's Fitness Baselayer Leggings
DARE 2B In The Zone Men's Fitness Baselayer Leggings
Sold and shipped by Regatta Ltd UK
£18.00£30.00
REGATTA Bampton Men's Fitness Baselayer Bottoms
REGATTA Bampton Men's Fitness Baselayer Bottoms
Sold and shipped by Regatta Ltd UK
£17.45£25.00
DARE 2B In The Zone II Men's Base Layer Leggings
DARE 2B In The Zone II Men's Base Layer Leggings
Sold and shipped by Regatta Ltd UK
£20.00£40.00
TCA Men's Power Compression Tights - Navy Eclipse
TCA Men's Power Compression Tights - Army
TCA Men's Power Compression Tights - Tornado
TCA Men's Power Compression Tights - Graphite
TCA Men's Power Compression Tights - White
TCA Men's Power Compression Tights - Black Stealth
TCA Men's Power Compression Tights - Pro White
TCA Men's Power Compression Tights - Grey Marl
Gallery item 1 out of 8
TCA Men's Power Compression Tights - Navy Eclipse
Rate: 1.0 stars, 1 votes
8 colors
Sold and shipped by Thorogood Sports Ltd
£16.99
HEAT HOLDERS Mens Cotton Thermal Underwear Bottoms Long Johns
HEAT HOLDERS Mens Cotton Thermal Underwear Bottoms Long Johns
Gallery item 1 out of 2
HEAT HOLDERS Mens Cotton Thermal Underwear Bottoms Long Johns
2 colors
Sold and shipped by Sock Snob UK
£18.23£18.99
HEAT HOLDERS Mens Fleece Lined Long John Thermal Bottoms | Lightweight
HEAT HOLDERS Mens Fleece Lined Long John Thermal Bottoms | Lightweight
Sold and shipped by Sock Snob UK
£22.87£25.99
HEAT HOLDERS Mens Fleece Lined Long John Thermal Bottoms | Ultra Lightweight
HEAT HOLDERS Mens Fleece Lined Long John Thermal Bottoms | Ultra Lightweight
Sold and shipped by Sock Snob UK
£22.87£25.99
HEAT HOLDERS Mens Fleece Lined Long John Thermal Bottoms | Original
HEAT HOLDERS Mens Fleece Lined Long John Thermal Bottoms | Original
Sold and shipped by Sock Snob UK
£22.87£25.99
CRAFT Active Intensity Baselayer Pants Men Black Asphalt
CRAFT Active Intensity Baselayer Pants Men Black Asphalt
Sold and shipped by Craft
£35.00
CRAFT ACTIVE EXTREME X BASELAYER PANTS MEN BLACK
CRAFT ACTIVE EXTREME X BASELAYER PANTS MEN BLACK
Sold and shipped by Craft
£40.00
CRAFT ACTIVE EXTREME X WIND BASELAYER PANTS MEN BLACK GRANITE
CRAFT ACTIVE EXTREME X WIND BASELAYER PANTS MEN BLACK GRANITE
Sold and shipped by Craft
£50.00
CRAFT ACTIVE EXTREME X WIND BOXER MEN BLACK GRANITE
CRAFT ACTIVE EXTREME X WIND BOXER MEN BLACK GRANITE
Sold and shipped by Craft
£35.00
WEDZE Men’s Seamless Ski Base Layer Bottoms - BL 900 - Blue
WEDZE Men’s Seamless Ski Base Layer Bottoms - BL 900 - Blue
Rate: 4.2 stars, 138 votes
£39.99
TRIBORD MEN’S SAILING TRUNKS SAILING 500 - GREY / BLACK
TRIBORD MEN’S SAILING TRUNKS SAILING 500 - GREY / BLACK
Rate: 4.6 stars, 19 votes
£27.99
Was £37.99
SWIX Base Layer Bottom SWIX
SWIX Base Layer Bottom SWIX
Rate: 5.0 stars, 2 votes
£19.99£34.99
WEDZE Men’s Seamless Ski Base Layer Bottom BL 580 I - Soft - Black/Blue
WEDZE Men’s Seamless Ski Base Layer Bottom BL 580 I - Soft - Black/Blue
Rate: 4.5 stars, 586 votes
£14.99£27.99
WEDZE Men's Ski Base Layer Bottoms - BL 500 - Black
WEDZE Men's Ski Base Layer Bottoms - BL 500 - Black
Rate: 4.6 stars, 1308 votes
£11.99£14.99
4.3/5 based on 13280 reviews collected online and in stores

Underwear you can wear to run, jump and play

Welcome to Decathlon's men's innerwear and thermals page. No matter if you do sport every day or occasionally we have the right clothes and equipment to meet your needs. Our men's innerwear and thermals are designed for different sports and intensity. Discover the range for cycling, running, skiing, football and other sports now.