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Rocky Thermal Underwear for Men, Long Johns Fleece Lined Set, Shirt & Pants, Base Layer w/Leggings/Bottoms Ski/Extreme Cold
Price: | $9.99$9.99 - $54.98$54.98
Free Returns on some sizes and colors
Select Size to see the return policy for the item |
US Thermal Underwear Base Layers
Brand Size | Chest (in) | Waist (in) | Hip (in) | Inseam (in) |
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Small | 35 - 37 | 29 - 31 | 37 | 29.1 |
Medium | 38 - 40 | 32 - 34 | 40 | 29.9 |
Large | 41 - 43 | 35 - 37 | 43 | 30.7 |
X-Large | 44 - 46 | 38 - 40 | 46 | 31.4 |
XX-Large | 47 - 49 | 41 - 43 | 50 | 32.2 |
3X-Large | 50 - 52 | 44 - 46 | 53 | 33.1 |
4X-Large | 52 - 54 | 47 - 49 | 56 | 33.8 |
5X-Large | 54 - 56 | 50 - 52 | 59 | 34.6 |
6X-Large | 56 - 58 | 53 - 55 | 62 | 35.4 |
Product details
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Fabric type90% Polyester, 10% Spandex
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Care instructionsMachine Wash
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OriginMade in the USA and Imported
About this item
- STAY-PUT DESIGN: Oversized jackets? Check. Bulky sweaters? Double check. Cargo pants loaded with all the essentials? Yup, even them. No matter how heavy your outer layers are, our men’s thermal underwear stays put under even the heaviest loads.
- KEEP WARM AND DRY: Ultra soft fleece lining insulated underwear combined with moisture-wicking power can only mean one thing: You’re wearing Rocky longjohns for men thermals. No more sweaty, shivering nights — just warm thermal clothes for men, toasty goodness that wraps you in whole body-comfort.
- ALL-DAY COMFORT: From morning jogs in freezing temps to chilly winter nights, our underoos mens long johns thermal set are designed to keep you comfortable and warm all day long. With soft fabric that’s lightweight yet warm, it’s the anti-chafing underwear men crave.
- LIGHT/MID/HEAVY OPTIONS: When you’re an active dude, you need Mens long underwear. Mens thermal underwear set that take on anything the day throws at you. Choose the light set for nippy mornings, standard for versatile layering options, or heavy for all-day activity in blistering temps.
- THERMALS MEN LOVE: Equipped with a luxurious contour pouch that keeps your important bits comfy and a vertical quick-draw fly for grab-and-go bathroom breaks, our fleece long johns for men are crafted to cater to the modern gentleman.
Additional Details


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From the brand

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At Rocky, our goal is simple: to bring fashion and comfort within everyone's reach. We believe that you should look and feel amazing every single day. We're on a mission to make our quality, durable clothing affordable for all. Every piece is crafted with your ultimate comfort in mind.
We’ve got you covered whether you’re relaxing at home, in the gym, or on the go.
Discover the Rocky difference. You deserve the best!
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Thermal Sets
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Kids Thermal Sets
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Thermal Pet Collection
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Rocky Leggings Collection
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Mens Boxers Collection
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Kids Onesie Collection
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Men's Socks
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Women's Socks
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Thermal Tops & Bottoms
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Kids Thermal Tops & Bottoms
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Thermal Christmas Collection
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Kids Christmas Collection
Product Description
LIGHTWEIGHT, YET WARM; THIN, YET LUXURIOUSLY SOFT.
When you’re an active guy who needs to stay warm, Rocky thermal wear brings the heat. From daring mountain descents down a black diamond to camping trips on the lake, our long johns work overtime to keep you protected — even in freezing temps.
ROCKY EFFORTLESSLY LOCKS HEAT TO BRAVE THE ELEMENTS WITHOUT FEELING BOGGED DOWN.
When winter strikes, you’ll be wishing you had a pair of Rocky thermal underwear. Made with just the right blend of poly-spandex, they’re the perfect balance between stretch and no-ride staying power. With ultra-light construction and cutting edge heat retention, enjoy cloud-like comfort all day.

Elastic Waistband

Quick-Draw Fly

Premium Stitching

Moisture Wicking Fibers

Rocky Product Recommendations...
![]() Men's Thermal Tops | ![]() Men's Zip-up Pullover
Add to Cart
| ![]() Face Mask Shirt
Add to Cart
| ![]() Men's Thermal Bottoms | ![]() Women's Thermal Underwear
Add to Cart
| ![]() Boy's Thermal Underwear | ![]() Girl's Thermal Underwear | |
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Customer Reviews
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3.5 out of 5 stars 2
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4.4 out of 5 stars 39
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4.4 out of 5 stars 240
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4.5 out of 5 stars 631
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4.4 out of 5 stars 5,911
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4.5 out of 5 stars 5,417
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4.4 out of 5 stars 5,460
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Price
| — | $17.99$17.99 | $17.99$17.99 | — | $23.49$23.49 | — | — |
Gender
| Men's | Men's | Unisex | Men's | Women's | Boy's | Girl's |
Size
| Small - 6X-Large | Small - 3X-Large | Small - 3X-Large | Small - 6X-Large | X-Small - 3X-Large | XX-Small - X-Large | XX-Small - X-Large |
Variation
| 23 Colors/Patterns | 3 Colors/Patterns | 3 Colors/Patterns | 23 Colors/Patterns | 24 Colors/Patterns | 23 Colors/Patterns | 34 Colors/Patterns |
Fabric
| Moisture Wicking Fabric | Moisture Wicking Fabric | Moisture Wicking Fabric | Moisture Wicking Fabric | Moisture Wicking Fabric | Moisture Wicking Fabric | Moisture Wicking Fabric |
Feature
| Snug Stay-Put-Fit | Snug Stay-Put-Fit | Snug Stay-Put-Fit | Anti-Squeeze Elastic Waistband | Snug Stay-Put-Fit | Snug Stay-Put-Fit | Snug Stay-Put-Fit |
Rocky Product Recommendations...
![]() Pet Thermals | ![]() Men's Boxer Briefs | ![]() Men's Boxer Briefs Cotton | ![]() Men's Solid Tube Socks
Add to Cart
| ![]() Men's Striped Tube Socks | ![]() Thermal Socks
Add to Cart
| ![]() Kid's Onesie Jumpsuit | |
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Customer Reviews
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3.8 out of 5 stars 66
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4.5 out of 5 stars 2,013
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4.2 out of 5 stars 619
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3.9 out of 5 stars 924
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3.9 out of 5 stars 1,610
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3.9 out of 5 stars 40
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3.9 out of 5 stars 457
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Price
| — | — | — | $19.99$19.99 | — | $14.99$14.99 | $19.99$19.99 |
Gender
| Pets | Men's | Men's | Men's | Men's | Unisex | Unisex |
Size
| XX-Small - X-Large | Small - 3X-Large | Small - 3X | One Size | 9 - 15 | One size | XX-Small - 3X |
Variation
| 17 Colors/Patterns | 12 Colors/Patterns | 12 Colors/Patterns | 3 Colors/Patterns | 3 Colors/Patterns | 4 Colors/Patterns | 9 Colors/Patterns |
Fabric
| Moisture Wicking Fabric | Breath Easy | 95% Cotton | Cotton Poly Blend | 90% Cotton | 90% Cotton | Breath Easy |
Feature
| Snug Stay-Put-Fit | Snug Stay-Put-Fit | Snug Stay-Put-Fit | Soft Seam Toe | Snug Stay-Put-Fit | Snug Stay-Put-Fit | Snug Stay-Put-Fit |
Product details
- Is Discontinued By Manufacturer : No
- Package Dimensions : 11.38 x 9.88 x 1.93 inches; 3.52 ounces
- Item model number : 108S-C
- Department : mens
- Date First Available : May 8, 2014
- ASIN : B00K7IR0J4
- Best Sellers Rank: #109,931 in Clothing, Shoes & Jewelry (See Top 100 in Clothing, Shoes & Jewelry)
- #44 in Men's Thermal Underwear
- Customer Reviews:
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Get to know how Rocky Men's Thermal Underwear feelsRocky Fashion
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers find the thermal underwear keeps them warm in cold weather and appreciate its soft, fleece-like interior. The quality is good with nice fabric, and customers consider it good value for the price. However, the fit receives mixed feedback, with some finding it perfect while others say it's too tight through the legs. Moreover, the material thickness is criticized as thin, and seam durability is poor with reports of stitching coming apart quickly.
AI-generated from the text of customer reviews
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Customers find the thermal underwear set keeps them warm, particularly in extremely cold weather, with one customer noting it works well in humid conditions without overheating.
"...The rest of me stayed comfortably warm in the 40° water, even though the drysuit itself didn't do much for warmth, it just kept me dry. **..." Read more
"Soft and comfortable warm and cozy. Fit like a glove." Read more
"...She did, and she loved the color and the warmth. Even though the top part is too small, the upper part is just right...." Read more
"Kept warm without being sweaty" Read more
Customers find the thermal underwear comfortable and incredibly soft on the skin, with a light fleece lining inside. One customer mentions it's relaxed enough to wear casually around the house.
"...The Fleece lining is very comfortable against my skin. I wear this under my drysuit. While in the water I found the sleeve of my drysuit had a leak...." Read more
"Soft and comfortable warm and cozy. Fit like a glove." Read more
"...Quality-made and soft on your skin. Great value for the price and would recommend them to anyone needing them for the cold winter months...." Read more
"Warm and comfortable" Read more
Customers find the thermal underwear set to be of excellent quality, with nice fabric that holds up well over time.
"...Quality-made and soft on your skin. Great value for the price and would recommend them to anyone needing them for the cold winter months...." Read more
"The product seems fine, haven't used it yet...." Read more
"...Quality looks good will see how it holds up after a few washings." Read more
"Nice but size smaller than regular U.S. sizes u may want to go up a size., my person is on the heavier side...." Read more
Customers find the thermal underwear set to be good value for money, describing it as a solid product and great for the price, with one customer noting it works better than high-priced brands.
"...Overall, this was a great buy and a much cheaper option than other base layers. I would definitely purchase this one again!..." Read more
"...Quality-made and soft on your skin. Great value for the price and would recommend them to anyone needing them for the cold winter months...." Read more
"Price is great for two pairs and the thermos was warm for my ski trip!" Read more
"It was a good price and good quality" Read more
Customers like the color of the thermal set, describing it as nice-looking and perfect, with one customer specifically mentioning the Kentucky blue shade.
"...She did, and she loved the color and the warmth. Even though the top part is too small, the upper part is just right...." Read more
"Really cool they glow in the dark, a little on the thin side if you live in a cold climate, true to size." Read more
"These are really nice-looking and soft, just too large." Read more
"Look, fit, softness all perfect !" Read more
Customers have mixed experiences with how the thermal underwear set fits, with some finding the XXL size comfortable while others report it runs too small.
"Soft and comfortable warm and cozy. Fit like a glove." Read more
"...50 inch chest, XXL fits well and comfortable, though the sleeves and legs are a bit long. Not a big deal, they can be bunched up...." Read more
"...I have a large, barrel chest and matching stomach, but the XXL’s fit well. I’d buy them again." Read more
"...Even though the top part is too small, the upper part is just right. So we are going to keep the bottom part and give away the upper part...." Read more
Customers report significant issues with the seams of the thermal underwear set, noting that they come apart within the first day of use, with hems at the legs and wrists being particularly problematic.
"Great fitting and warm thermals. Stitching started to go after first wash on one pair" Read more
"The first pair ripped in a place on the waist, I sewed it back and hope it last my husband loved the feel of them so I ordered another pair" Read more
"...Then less than a month later, it stopped running! So I still don't have a working watch. I updated my review...." Read more
"...was a ~1cm hole at the bottom seam of the crotch, and two bad seams on the shirt that will likely fray or tear...." Read more
Customers have mixed opinions about the material thickness of the thermal set, with some appreciating that it feels like a thick pair of pajamas, while others find it too thin.
"...I find the fabric is a bit thin, so it does not provide a lot of warmth, but enough to keep you warm when it's a bit cold...." Read more
"Despite the seemingly thin density of the fabric, these really did the job keeping me warm during an Alaska fishing trip." Read more
"...are that they are fleece lined, making them somewhat thicker than other similar thermals, and the stitching is haphazard with hanging threads and..." Read more
"...The first day I wore these heavyweight long johns, I noticed a significant difference in how my legs and torso felt...." Read more
Reviews with images

Great item
Top reviews from the United States
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- Reviewed in the United States on February 25, 2022Team Name: One PackAthlete: Standard Weight (185 GSM)Size: XX-LargeColor: BlackVerified PurchaseFirst, I'm 5'7", 250 lbs, 38-40 waist, 50 inch chest, XXL fits well and comfortable, though the sleeves and legs are a bit long. Not a big deal, they can be bunched up.
The Fleece lining is very comfortable against my skin. I wear this under my drysuit. While in the water I found the sleeve of my drysuit had a leak. As the cold water came in, the sleeve of this base layer got pretty wet. The wet sleeve felt cold, but it still kept me fairly warm and didn't absorb much of the water, helping me to stay warm. The rest of me stayed comfortably warm in the 40° water, even though the drysuit itself didn't do much for warmth, it just kept me dry.
**UPDATE** I have now worn this for three sessions of rolling practice in my kayak. I still have a small pinhole leak somewhere in the back panel of my drysuit, but it doesn't leak too much so I don't worry about it. This baselayer is still keeping me warm as the only thing I'm wearing under my drysuit in 45°f water, even when slightly damp. This isn't just while sitting inside the kayak, but also while submerged upside down and while swimming during a wet exit. This really is a great mid weight base layer, and one that any kayaker should consider for under their drysuit! If you're going to be in water any colder than this though, especially if the air temperatures are cold, I would recommend doubling up layers and either wearing a second set of these or getting a heavier layer to wear over them.
Overall, this was a great buy and a much cheaper option than other base layers. I would definitely purchase this one again!
-Piper's boyfriend :-)
- Reviewed in the United States on January 31, 2025Team Name: One PackAthlete: Light Weight (165 GSM)Size: LargeColor: Melange GreyVerified PurchaseSoft and comfortable warm and cozy. Fit like a glove.
- Reviewed in the United States on January 19, 2025Team Name: One PackAthlete: Standard Weight (185 GSM)Size: MediumColor: Christmas DesignVerified PurchaseWhen I noticed that there was no pee port on this pair of thermal underwear, I was quite disappointed. But I wondered if perhaps it was made to be worn by women and had gotten thrown in with the men's wear by mistake. Or maybe it was a manufacturer's oversight. At any rate, when I told my wife about the problem and said I was going to return the underwear, she said, "Wait a minute, let me try it on." She did, and she loved the color and the warmth. Even though the top part is too small, the upper part is just right. So we are going to keep the bottom part and give away the upper part. So all is well here. I would think you would like to know about this so that other online customers will not be mislead.
- Reviewed in the United States on May 2, 2025Team Name: One PackAthlete: Standard Weight (185 GSM)Size: LargeColor: BlackVerified PurchaseKept warm without being sweaty
- Reviewed in the United States on December 22, 2024Team Name: One PackAthlete: Heavy Weight (250 GSM)Size: XX-LargeColor: WhiteVerified PurchaseIt is extremely comfortable and keeps you warm. It doesn't show through your clothes so nobody knows you're wearing them. Quality-made and soft on your skin. Great value for the price and would recommend them to anyone needing them for the cold winter months. You may want to get 2 pairs to always have on hand.
- Reviewed in the United States on February 5, 2025Team Name: One PackAthlete: Light Weight (165 GSM)Size: XX-LargeColor: NavyVerified PurchaseI was skeptical about the thin material, but have found that these thermal underwear are as warm as the quilted cotton ones.
They fit more snugly than the others, but this has not been a problem. I have a large, barrel chest and matching stomach, but the XXL’s fit well.
I’d buy them again.
- Reviewed in the United States on January 28, 2025Team Name: Two PackAthlete: Standard Weight (185 GSM)Size: LargeColor: BlackVerified PurchaseThe product seems fine, haven't used it yet. The problem is that I ordered the two pack for 50 dollars and the as stated that there were 2 complete sets and I only got one complete set, thinking of returning that set
- Reviewed in the United States on April 25, 2025Team Name: One PackAthlete: Standard Weight (185 GSM)Size: X-LargeColor: WhiteVerified PurchaseWarm and comfortable
Top reviews from other countries
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سليمان عبدالرحمن النملةReviewed in Saudi Arabia on February 2, 2025
2.0 out of 5 stars الوزن وقوة التدفئة
Team Name: One PackAthlete: Standard Weight (185 GSM)Size: X-LargeColor: Heather GreyVerified Purchaseغير مناسب لي خفيف وليس مدافي
- AJMALReviewed in the United Arab Emirates on September 29, 2020
4.0 out of 5 stars Good stuff
Team Name: One PackAthlete: Standard Weight (185 GSM)Size: X-LargeColor: NavyVerified PurchaseGood stuff
Bought one size up
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KhaledReviewed in Saudi Arabia on October 26, 2024
2.0 out of 5 stars القماش خفيف واللون ليس كما في الصورة.
Team Name: One PackAthlete: Heavy Weight (250 GSM)Size: MediumColor: WhiteVerified Purchaseاللون (بيج) وليس كما في الصورة، والقماش خفيف.
- OzCableguyReviewed in Australia on July 27, 2020
5.0 out of 5 stars Well priced, nice fit, warm
Nice and warm, but not stupidly warm. Great for cycling in the Queensland subtropical winter where it's not quite cold enough for a full coat but too cold for just a T shirt.
- Abo ThamerReviewed in Saudi Arabia on December 12, 2024
3.0 out of 5 stars The color was not white!
Team Name: One PackAthlete: Standard Weight (185 GSM)Size: SmallColor: WhiteVerified PurchaseAs stated,The color was not white, it was like cream or light yellow, this is not acceptable specially from highly rated merchant! All my clothes are white and I can't wear cream or light yellow underwear, I sent it back and waiting for my refund !