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.
892 items
JEEP Mens Thermal Boot Hiking Socks for Winter
JEEP Mens Thermal Boot Hiking Socks for Winter
JEEP Mens Thermal Boot Hiking Socks for Winter
JEEP Mens Thermal Boot Hiking Socks for Winter
Gallery item 1 out of 4
JEEP Mens Thermal Boot Hiking Socks for Winter
4 colors
Sold and shipped by Sock Snob UK
£10.99
BRIDGEDALE HIKE Lightweight Merino Performance Boot Original Men's - Navy blue
BRIDGEDALE EXPLORER Heavyweight Merino Performance Boot Unisex - Olive
Gallery item 1 out of 2
BRIDGEDALE HIKE Lightweight Merino Performance Boot Original Men's - Navy blue
2 colors
Sold and shipped by Sock Snob UK
£23.99£24.99
HEAT HOLDERS Mens Thick Heavy 2.7 TOG Short Thermal Wool Rich Socks
HEAT HOLDERS Mens Thick Heavy 2.7 TOG Short Thermal Wool Rich Socks
HEAT HOLDERS Mens Thick Heavy 2.7 TOG Short Thermal Wool Rich Socks
HEAT HOLDERS Mens Thick Heavy 2.7 TOG Short Thermal Wool Rich Socks
HEAT HOLDERS Mens Thick Heavy 2.7 TOG Short Thermal Wool Rich Socks
Gallery item 1 out of 5
HEAT HOLDERS Mens Thick Heavy 2.7 TOG Short Thermal Wool Rich Socks
5 colors
Sold and shipped by Sock Snob UK
£15.35£15.99
HEAT HOLDERS Mens Warm Winter Knee High Ribbed Thermal Boot Socks
HEAT HOLDERS Mens Warm Winter Knee High Ribbed Thermal Boot Socks
HEAT HOLDERS Mens Warm Winter Knee High Ribbed Thermal Boot Socks
Gallery item 1 out of 3
HEAT HOLDERS Mens Warm Winter Knee High Ribbed Thermal Boot Socks
3 colors
Sold and shipped by Sock Snob UK
£15.35£15.99
1000 MILE 1000 Mile 2265 Trail Sock Twin Pack
1000 MILE 1000 Mile 2265 Trail Sock Twin Pack
Gallery item 1 out of 2
1000 MILE 1000 Mile 2265 Trail Sock Twin Pack
2 colors
Sold and shipped by Bowls4u T/A 4U Trading Group
£17.20
1000 MILE 1000 Mile Fusion Repreve Double Layer Sock Charcoal Marl/Black
1000 MILE 1000 Mile Fusion Repreve Double Layer Sock Charcoal Marl/Black
Sold and shipped by Bowls4u T/A 4U Trading Group
£19.80
COUNTRY PURSUIT Mens Knee High Thick Heavy Outdoor Fisherman Socks for Angling
COUNTRY PURSUIT Mens Knee High Thick Heavy Outdoor Fisherman Socks for Angling
Gallery item 1 out of 2
COUNTRY PURSUIT Mens Knee High Thick Heavy Outdoor Fisherman Socks for Angling
2 colors
Sold and shipped by Sock Snob UK
£11.51£11.99
BRIDGEDALE HIKE Midweight Merino Comfort Boot Men's - Light Grey
BRIDGEDALE HIKE Midweight Merino Comfort Boot Men's - Light Grey
Sold and shipped by Sock Snob UK
£24.95£25.99
BRIDGEDALE HIKE Ultralight T2 Coolmax Performance Boot Men's - Black
BRIDGEDALE HIKE Ultralight T2 Coolmax Performance Boot Men's - Black
Sold and shipped by Bowls4u T/A 4U Trading Group
£19.03
BRIDGEDALE EXPLORER Heavyweight Merino Performance Boot Unisex - Black
BRIDGEDALE EXPLORER Heavyweight Merino Performance Boot Unisex - Black
Sold and shipped by Sock Snob UK
£26.87£27.99
COUNTRY PURSUIT Mens Long Knee High Wool Military Action Army Style Socks for Boots
COUNTRY PURSUIT Mens Long Knee High Wool Military Action Army Style Socks for Boots
COUNTRY PURSUIT Mens Long Knee High Wool Military Action Army Style Socks for Boots
Gallery item 1 out of 3
COUNTRY PURSUIT Mens Long Knee High Wool Military Action Army Style Socks for Boots
3 colors
Sold and shipped by Sock Snob UK
£10.55£10.99
PUMA Puma Crew Heritage Stripe Sock (2 Pair)
PUMA Puma Crew Heritage Stripe Sock (2 Pair)
Gallery item 1 out of 2
PUMA Puma Crew Heritage Stripe Sock (2 Pair)
2 colors
Sold and shipped by Bowls4u T/A 4U Trading Group
£10.58
BRIDGEDALE TRAIL RUN Ultralight T2 Merino Sport 3/4 Crew Men's - Black
BRIDGEDALE TRAIL RUN Ultralight T2 Merino Sport 3/4 Crew Men's - Black
Sold and shipped by Sock Snob UK
£22.07£22.99
1000 MILE 1000 Mile Fusion Repreve Double Layer Sock Navy Marl/Royal Blue
1000 MILE 1000 Mile Fusion Repreve Double Layer Sock Navy Marl/Royal Blue
Sold and shipped by Bowls4u T/A 4U Trading Group
£19.80
KIPSTA Adult Base Layer Top Keepwarm 900 - Dark Grey
KIPSTA Adult Base Layer Top Keepwarm 900 - Dark Grey
Rate: 4.7 stars, 517 votes
£29.99
WEDZE Men’s Seamless Ski Base Layer Top BL 980 – Blue/Grey
WEDZE Men’s Seamless Ski Base Layer Top BL 980 – Blue/Grey
Rate: 4.6 stars, 594 votes
£49.99
SPEEDO ECO Endurance+ 7cm Adult Male Swimming Brief
SPEEDO ECO Endurance+ 7cm Adult Male Swimming Brief
Sold and shipped by SPEEDO INTERNATIONAL LIMITED
£24.49
ZONE3 Neoprene HeatTech Warmth Swim Socks Adult's Black
ZONE3 Neoprene HeatTech Warmth Swim Socks Adult's Black
Sold and shipped by ZONE3 LTD
£39.00
SPEEDO ECO Endurance+ Adult Male Aquashort
SPEEDO ECO Endurance+ Adult Male Aquashort
Sold and shipped by SPEEDO INTERNATIONAL LIMITED
£28.49
SPEEDO Hyper Boom V-Cut Adult Male Aquashort
SPEEDO Hyper Boom V-Cut Adult Male Aquashort
Sold and shipped by SPEEDO INTERNATIONAL LIMITED
£24.99£37.00
SPEEDO Hyper Boom Placement Adult Male Aquashort
SPEEDO Hyper Boom Placement Adult Male Aquashort
Sold and shipped by SPEEDO INTERNATIONAL LIMITED
£26.99£31.00
SPEEDO Medley Logo 7cm Adult Male Swim Brief Black/Grey
SPEEDO Medley Logo 7cm Adult Male Swim Brief Black/Grey
Sold and shipped by SPEEDO INTERNATIONAL LIMITED
£17.99£24.00
SPEEDO ECO Endurance+ 17cm Adult Male Swimming Brief
SPEEDO ECO Endurance+ 17cm Adult Male Swimming Brief
Sold and shipped by SPEEDO INTERNATIONAL LIMITED
£23.49
SPEEDO Men's Hyper Boom Splice Aquashorts Black/Blue
SPEEDO Men's Hyper Boom Splice Aquashorts Black/Blue
Rate: 5.0 stars, 1 votes
Sold and shipped by SPEEDO INTERNATIONAL LIMITED
£29.99£33.00
ZONE3 Swim Brief Shorts Men's KONA SPEED Black
ZONE3 Swim Brief Shorts Men's KONA SPEED Black
Sold and shipped by ZONE3 LTD
£28.00
SPEEDO Mens ECO Endurance + 7cm Brief
SPEEDO Mens ECO Endurance + 7cm Brief
Sold and shipped by SPEEDO INTERNATIONAL LIMITED
£24.50
SPEEDO ECO Endurance+ 7cm Adult Male Swimming Brief
SPEEDO ECO Endurance+ 7cm Adult Male Swimming Brief
Sold and shipped by SPEEDO INTERNATIONAL LIMITED
£24.49
SPEEDO ECO Endurance+ 7cm Adult Male Swimming Brief
SPEEDO ECO Endurance+ 7cm Adult Male Swimming Brief
Sold and shipped by SPEEDO INTERNATIONAL LIMITED
£24.49
ZONE3 Yulex Swim Socks
ZONE3 Yulex Swim Socks
Sold and shipped by ZONE3 LTD
£39.00
ZONE3 Seamless Support Boxers
ZONE3 Seamless Support Boxers
Sold and shipped by ZONE3 LTD
£8.00£16.00
SPEEDO Hyper Boom V-Cut Adult Male Aquashort
SPEEDO Hyper Boom V-Cut Adult Male Aquashort
Sold and shipped by SPEEDO INTERNATIONAL LIMITED
£24.99£37.00
SPEEDO Mens ECO Endurance + 7cm Brief
SPEEDO Mens ECO Endurance + 7cm Brief
Sold and shipped by SPEEDO INTERNATIONAL LIMITED
£24.50
SPEEDO Mens 5cm Escape Brief
SPEEDO Mens 5cm Escape Brief
Sold and shipped by SPEEDO INTERNATIONAL LIMITED
£29.99£32.00
KIPSTA Adult Short-Sleeved Thermal Base Layer Top Keepdry - Aniseed
KIPSTA Adult Short-Sleeved Thermal Base Layer Top Keepdry 500 - Black
Gallery item 1 out of 2
KIPSTA Adult Short-Sleeved Thermal Base Layer Top Keepdry - Aniseed
Rate: 4.7 stars, 1299 votes
2 colors
£7.99£12.99
KIPRUN Running Socks Run 900 X - White / Orange
KIPRUN Running Socks Run 900 X - White / Orange
Rate: 4.6 stars, 101 votes
£17.99
TCA Men's Super Thermal Compression Shorts - Sonic Yellow
TCA Men's SuperThermal Compression Baselayer Short
TCA Men's SuperThermal Compression Baselayer Short
TCA Men's SuperThermal Compression Baselayer Short
TCA Men's Super Thermal Compression Shorts - Graphite
Gallery item 1 out of 5
TCA Men's Super Thermal Compression Shorts - Sonic Yellow
Rate: 4.0 stars, 1 votes
5 colors
Sold and shipped by Thorogood Sports Ltd
£18.99
PUMA Mens Quarter Socks (Pack of 3) (Black)
PUMA Mens Quarter Socks (Pack of 3) (Black)
Sold and shipped by Pertemba GB
£11.49
DARE 2B Mens Slogan Cycling Socks (Trail Blaze Orange/Slate)
DARE 2B Mens Slogan Cycling Socks (Black/White)
Gallery item 1 out of 2
DARE 2B Mens Slogan Cycling Socks (Trail Blaze Orange/Slate)
2 colors
Sold and shipped by Pertemba GB
£6.49
UMBRO Mens Primo Football Socks (Yellow/Black)
UMBRO Mens Primo Football Socks (Emerald/White)
UMBRO Mens Primo Football Socks (Royal Blue/White)
UMBRO Mens Primo Football Socks (Vermillion/White)
UMBRO Mens Primo Football Socks (Black/White)
UMBRO Mens Primo Football Socks (Dark Navy/White)
Gallery item 1 out of 6
UMBRO Mens Primo Football Socks (Yellow/Black)
6 colors
Sold and shipped by Pertemba GB
£6.99
PUMA Unisex Adult Trainer Socks (Pack of 3) (White)
PUMA Unisex Adult Trainer Socks (Pack of 3) (Black)
Gallery item 1 out of 2
PUMA Unisex Adult Trainer Socks (Pack of 3) (White)
2 colors
Sold and shipped by Pertemba GB
£11.49
4.5/5 based on 439077 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.