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🔥 Elevate your winter game with Thermajohn – warmth that moves with you!
Thermajohn Men's J-t-m-1836 long johns combine advanced heat retention, ultra-soft fleece lining, and moisture-wicking breathable fabric with 4-way stretch technology, delivering a premium thermal base layer designed for all-day comfort and freedom of movement in cold weather.

| Asin | B0CPRQ63XV |
| Best Sellers Rank | #72 in Men's Thermal Underwear Bottoms |
| Date First Available | November 23, 2015 |
| Department | mens |
| Manufacturer | Thermajohn |
| Package Dimensions | 12.32 x 9.37 x 2.17 inches; 14.07 ounces |
User
Your Hot, Thermajohns!
These are surprisingly warmer than I expected after receiving them. Seem very thin and not warm at all. WRONG! Light weight of product is very deceiving. Outfit is very warm when needed and not at all bulky like some of years ago. Very pleased with product.
User
5-Star Review for Thermajohn Long Johns – AKA My Cold Weather Survival Suit
I never thought I’d be this emotionally attached to a pair of long johns, but here we are. The Thermajohn Thermal Underwear Set is like a warm hug from a teddy bear who also happens to be a professional insulation expert. Seriously—this fleece-lined base layer has no business being this cozy.I put them on during a cold snap and haven’t looked back since. I’ve worn them under jeans, joggers, and even pajama pants (don’t judge me). I’d wear them to work if I could. They’re warm but not bulky, stretchy without being saggy, and soft enough to make you question every other piece of clothing you own.Also, shoutout to the waistband for staying in place and not playing “let’s roll down every 10 minutes.” These long johns understood the assignment.If you’re looking to brave the cold while feeling like a warm cinnamon roll, these are it. Buy them. Your frozen thighs will thank you.
User
Keeps me warm
Keeps me warm
User
Size wise they run small
Seem warm and comfortable but not any warmer than other long johns I have, Note the sizing seems really small. I purchased medium bit was concerned it would be too large, actually it is slightly small. If i get another pair i think I will get a large
User
RELAXING FIT.
COMFORTABLE
User
i Can't Believe What I've been missing!
I can't believe what I've been missing. These thermals are fantastic and if you're a previous owner of the square pattern type thermals then you MUST upgrade. It' been quite a few years since I invested in thermal wear and then it was sport specific for mountain bike racing. I'm talking $300 a pop per garment. I'm out of that game and hope never to spend a fortune again for that heat thermal clothing.Back to the thick of the conversation which was the review. How do they size? They come true to fit. They are skin tight which is what you want. If you are complaining because they don't fit loose like your normal clothes ask one of your cool friends in the know. I will say the one thing that I noticed is that I can pull the shirt all the way down to the top of my quads, but after a few 30 minutes or so the shirt has managed to ride up to above my abdomen. Not a deal breaker. I believe proper thermal wear etiquette requires you to tuck the shirt inside the waistband of the johns. Another plus is the micro-fleece layer inside thermals, man the microfleece is absolute heaven against your skin. For the micro-fleece feeling alone I will buy 10 more - so I don't have to do laundry. As far as temperature retention, It was 35F the other day and I spent the whole day outside with minimal layers - I wanted to test the low temperature rating on the coldest day so far - and I can attest to Thermajohn's ability to keep me toasty. I know many of you are saying, "Well I live where it's' colder than 30F, or some of you my say screw you I live in places so cold it's subzero". well to all of you I say, buy the thermajohn's and make them the first cozy layer against your skin and then proceed with your cold weather ritual, or go crazy and buy lots of new winter clothing.
User
Solid material
I work in a warehouse that ranges from -20 degrees Fahrenheit to around 40 degrees. It’s cold in there. I’m picking ice cream and meat or produce and groceries in the freezing arctic cold. These were my savior of cold aches after my shift. My joints would be all cranky after the shift but no more. These keep me nice and warm, and honestly maybe a little too warm at times if I’ve had too much caffeine. Don’t restrict my movement at all, and they’re super low key. I should’ve bought a large though: I have a large torso but a short build. I’m 5’10” and my torso is a little bit longer than others, making my legs just a little short in comparison. The legs were also just barely not long enough for my liking but no discomfort. Overall great buy, functions well, and I will continue to use this baby to stay warm
User
Great buy - keeps you warm and cozy!
My husband say they are impressively warm without feeling bulky. The fabric is soft, stretchy, and comfortable enough for all‑day wear, whether you’re outside in freezing temperatures or just trying to stay cozy indoors. They wick moisture well and hold their shape after washing, which makes them a reliable winter staple. A solid choice if you want affordable thermal layers that actually perform.
User
Not warm… its kind of fleece
Size is good.. but is not warm enough… it’s basically just a fleece type
User
Buena, no excelente
El producto es calientito y cómodo, pero ya desde los primeros días es notorio que la tela se le hacen bolitas.
User
Muy bien
Muy buena! Mantiene el calor , bien a la talla
User
Ropa térmica.
Ropa comprada para regalo y la opinión de quién lo recibió es que le agradaron mucho pues la tela es suave.
User
Recommend
I purchased these for my son’s school camp and they lasted really well as he is really tough on his clothes. Not really suitable for freezing cold conditions but they were perfect for camping in the cooler months.
Trustpilot
1 day ago
1 month ago