Best Thermal Sports Underwear for Men of 2026

John Zimmer Avatar
John Zimmer
Last Updated: 3 Feb 2026

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Stay warm and comfortable during your outdoor activities with these thermal sports underwear. Designed specifically for men, these undergarments provide an extra layer of insulation to keep you cosy in colder temperatures. Made from high-quality materials, they are breathable and moisture-wicking, ensuring you stay dry even during intense workouts. The snug fit and stretchy fabric allow for unrestricted movement, making them ideal for sports such as skiing, hiking, or running. Don't let the cold weather hinder your performance - invest in these thermal sports underwear for ultimate comfort and warmth.

At a Glance: Our Top Picks

BRUBECK Merino Wool Thermal Long Sleeve Top Cover #TOP 1
BRUBECK Merino Wool Thermal Long Sleeve Top
ftb score rating icon 9.9
RP Collections Mens Thermal T-Shirt Charcoal Cover #TOP 2
RP Collections Mens Thermal T-Shirt Charcoal
ftb score rating icon 9.8
CMP 3Y97804 Seamless Thermal Underwear Black Cover #TOP 3
CMP 3Y97804 Seamless Thermal Underwear Black
ftb score rating icon 9.6

Top 3 Thermal Sports Underwear for Men

#TOP 1

BRUBECK Merino Wool Thermal Long Sleeve Top

BRUBECK
LS12820
Black
BRUBECK Merino Wool Thermal Long Sleeve Top Cover
BRUBECK LS12820 Men's Long-Sleeved Functional Shirt | Breathable | Thermal | Sports | Fitness | Undershirt | Underwear | 41% Merino Wool Black

The BRUBECK Thermal Long Sleeve is designed for comfort and performance. Made with a high percentage of natural merino wool, it offers a light and soft feel against your skin, ensuring a second skin sensation. Its anti-allergic and anti-bacterial properties protect you from skin irritation, making it ideal for winter sports. The thermal-regulating material keeps you warm without overheating, providing excellent moisture management during your activities. You can wear it confidently while skiing, cycling, or walking outdoors.

What We Like
Lightweight and soft fabric
Anti-allergic and anti-bacterial
Thermal-regulating properties
Perfect for winter sports
Snug fit and flexibility
#TOP 2

RP Collections Mens Thermal T-Shirt Charcoal

GAMT0308-2XC
Grey
RP Collections Mens Thermal T-Shirt Charcoal Cover
RP Collections® Mens Thermal Underwear T-Shirt Charcoal 2XL

The RP Collections Thermal T-Shirt is a British-designed short-sleeved garment made from soft, fully brushed thermal fabric, ensuring you stay warm in colder conditions. This blend of 50% cotton and 50% polyester makes it easy to care for, as it is machine washable at home. You can comfortably wear it under your everyday clothes, making it a versatile addition to your wardrobe. Whether you need it for sleepwear, lounging, or engaging in outdoor sports like skiing and hiking, this thermal t-shirt has you covered.

What We Like
Soft and warm fabric
Machine washable for convenience
Versatile for different activities
Ideal for outdoor workers
#TOP 3

CMP 3Y97804 Seamless Thermal Underwear Black

CMP
3Y97804
Black
L-XL
CMP 3Y97804 Seamless Thermal Underwear Black Cover
CMP 3Y97804 Thermal Underwear Black L/XL

The CMP 3Y97804 Thermal Underwear offers seamless comfort, meaning you won’t have to deal with irritating seams that can rub and cause discomfort. Its quick moisture transport feature helps keep you dry by moving sweat away from your skin, which is especially handy during intense activities. Thanks to its quick-drying fabric, you can stay comfortable for longer periods without feeling damp. The flat seams add to the comfort by preventing pressure pain, so you can focus on your sport or daily activities without distractions. Overall, this underwear is designed to keep you warm and comfortable.

What We Like
Seamless, no irritation
Quick moisture transport
Fast drying fabric
Flat seams prevent pressure
Buying Guide Image

Frequently Asked Questions (FAQs)

1. Which is the best thermal underwear?

Best Overall: Smartwool Intraknit Merino 250 Thermal Bottoms If you need a pair of thermal underwear that works well to keep you at a comfortable temperature no matter what you're doing, invest in this pair from Smartwool. The knees of these leggings are also ribbed, which allows for more durability and flexibility.

2. What thermal underwear is warmest?

Merino wool is the best material for thermals For maximum warmth, wool, specifically from merino sheep, is your best bet for thermal underwear. According to Smartwool, merino wool is ultra-thin — one-third of the diameter of a human hair — and soft, unlike the prickly, itchy feel of traditional wool.

3. What is the best thermal underwear for cold weather?

Merino. Merino baselayers are considered by many (including me) as the best type of fabric for extreme cold weather long johns. Merino base layers are great for almost all kinds of weather conditions; they're great at quickly wicking away moisture and are naturally odor-resistant.

4. What thermals do the military use?

The ECWCS was developed by the United States Army as a protective clothing system. The system used a triple layering system to created an insulated platform to maintain a soldier's mobility and survivability in extreme environments.

Editor's Notes

During our thermal sports underwear for men research, we found 46 thermal sports underwear for men products and shortlisted 3 quality products. We collected and analyzed 5,295 customer reviews through our big data system to write the thermal sports underwear for men list. We found that most customers choose thermal sports underwear for men with an average price of £26.59.

The thermal sports underwear for men are available for purchase. We have researched hundreds of brands and picked the top brands of thermal sports underwear for men, including BRUBECK, RP Collections, CMP.

Written by
John Zimmer Avatar

John Zimmer is a truly professional writer on findthisbest.com. He has specialized in writing content a wide variety of fields for over a decade. Since 2011, he has been using his expertise and extensive experience to write content for online shopping guide websites. In addition to writing for findthisbest.com, he has appeared in publications such as The Spruce, Wirecutter and Bestbuy.